From the Japanese patent site translated using their software.
If you can wade thru it, you will see that materials are discussed, and a lot of the compromises involved.
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[Detailed Description of the Invention]
[Field of the Invention]
[0001]
The present invention relates to a mounting device and an imaging device.
[Background of the Invention]
[0002]
Mount of the bayonet system is proposed as a lens attachment-and-detachment mechanism of a camera with interchangeable lenses with an exchangeable taking lens. Below, mount is described to be also a mounting device. The mounting device of the bayonet system provided by the camera is described to be camera mount.
[0003]
If a metallic material is used for the construction material of camera mount, the strength of mount will be secured, but if attachment and detachment of a taking lens (lens device) are repeated, a mount surface will be worn out and appearance grace will be spoiled by the abrasion. Wear becomes a cause, the slidability of a mount surface is deteriorated, attachment-and-detachment torque becomes high, and an operation feeling becomes less good. In order to secure the abrasion resistance of mount, and slidability, when a resin material is used as construction material of the whole mount, as compared with the case where a metallic material is used, strength is weak.
[0004]
In order to compensate the characteristic of a metallic material and resin mutually, the mount which molded metal and resin integrally is proposed. The Patent document 1 is disclosing mount of composition of having the mount main part which constituted the mount surface from a synthetic resin excellent in abrasion resistance and a sliding feel, and a metal ring component for reinforcing this mount main part.
[Citation list]
[Patent literature]
[0005]
[Patent document 1] JP,H03-236035,A
[Summary of Invention]
[Problem to be solved by the invention]
[0006]
However, since the mount main part is resin, the mount which the Patent document 1 is disclosing has the problem that strength is inferior compared with the mount which formed the mount main part with metal. Since an appearance part is fundamentally formed by resin, it is inferior to appearance grace.
[0007]
The present invention is excellent in the sliding characteristic of a mount surface, and its strength is high and it aims at offer of the mounting device which is excellent in appearance grace.
[Means for solving problem]
[0008]
The mounting device of the present invention is a mounting device which makes first optical apparatus and second optical apparatus of each other detach and attach and which was provided by the above-mentioned first optical apparatus. The aforementioned mounting device comprises carrying out a metal department and a resin part integrally, It has a base level of the mounting device provided by the above-mentioned second optical apparatus, and a mount surface which opposes, the outer peripheral part of the aforementioned mount surface is formed by the aforementioned resin part, and the body part of the aforementioned mounting device containing the portion inside the outer peripheral part of the aforementioned mount surface is formed by the aforementioned metal department.
[Effect of the Invention]
[0009]
According to the present invention, the mounting device which has sufficient strength, is excellent in the slidability of lens attachment and detachment and abrasion resistance, and excellent in appearance grace can be provided.
[Brief Description of the Drawings]
[0010]
[Drawing 1]It is an example of the front view of an imaging device provided with the camera mount of this embodiment.
[Drawing 2]It is a figure showing an example of the section of the camera mount part of the imaging device of the working example 1.
[Drawing 3]It is a figure showing the state where the nail of camera mount was seen from the inside.
[Drawing 4]It is a cross sectional view of the camera mount at the time of lens detaching operation, and lens mount.
[Drawing 5]It is a cross sectional view of the camera mount at the time of lens detaching operation, and lens mount.
[Drawing 6]It is an example of the front view of camera mount.
[Drawing 7]It is a cross sectional view of the camera mount at the time of lens detaching operation, and lens mount.
[Description of Embodiments]
[0011]
Fig.6 is an example of the front view of camera mount. In
Fig.6, it is the camera mount by which 101 was attached to the camera body and 110 was attached to the camera body 101. The camera mount 110 is fixed to the camera body 101 by two or more camera mount set screws 111a, 111b, 111c, and 111d.
[0012]
In the surface of the camera mount 110, it has a base level of the lens mount provided by the taking lens (lens device), and 110 d of camera mount surfaces which oppose. The base level which specifies a flange back is formed in 110 d of this camera mount surface. The lens attachment indices 110e and 110f are provided by the position at camera mount surface 110d top 12:00, and the position at abbreviated 1:00.
[0013]
This mount corresponds to the lens of two kinds of standards that standards differ, and two kinds of lens attachment indices 110e and 110f corresponding to each standard are provided. The lens lock pin 112 is arranged at the position at 3:00 on the camera mount surface 110d. The lens lock pin 112 can move to 110 d of camera mount surfaces, and is energized in the direction projected from 110 d of camera mount surfaces.
[0014]
The three camera mount nails 110a, 110b, and 110c are formed in the inner periphery of the camera mount 110. Wearing of a taking lens is performed by inserting lens mount in the camera mount 110 together with the lens attachment index that camera mount corresponds the index position of a taking lens, making it abut the base level of mount of a taking lens, and the base level of camera mount, and carrying out predetermined angle rotation of the lens.
[0015]
In a lens mounting state, the lens lock pin 112 engages with the lock hole formed in the predetermined position of lens mount, and restricts rotation of a lens, and the camera mount nails 110a, 110b, and 110c engage with the claw part to which the lens mount of a taking lens corresponds.
[0016]
The spring member is arranged, the claw part of the engaged lens mount is drawn in the back side of the camera mount nails 110a, 110b, and 110c, and an abutment with the base level of mount of a taking lens and the base level of camera mount is held.
[0017]
When removing a lens, it carries out by carrying out the depression of the lens lock release button of a camera by evacuating the lens lock pin 112 from 110 d of camera mount surfaces, and making the time of lens wearing, and a counter direction rotate a predetermined angle lens.
[0018]
Fig.7 is a cross sectional view of the camera mount at the time of lens detaching operation, and lens mount. As shown in
Fig.7, in the engaged claw part, backlash exists in an optical axis direction so that each can slide between the camera mount 110 and the lens mount 120.
[0019]
At the time of taking-lens attachment and detachment, a taking lens may incline slightly by backlash to camera mount owing to the bias of weight of a taking lens and a camera, and the power at the time of detaching operation, etc.
Fig.7 shows the state where the taking lens 121 leans downward. In that case, only the outer peripheral part 110g of 110 d of camera mount surfaces will contact [ a lens mount surface and ], and will slide. If the taking lens 121 is detached and attached so that whole surface homogeneity may be contacted and it may slide on it, even when wear by repetition of attachment and detachment is satisfactory, in the state of contacting and sliding partially, a contact pressure and frictional force become high locally, and wear advances easily. Since it is such, if attachment and detachment of the taking lens 121 are repeated, it is common that wear advances from the outer peripheral part 110g of 110 d of camera mount surfaces.
[0020]
As construction material of mount, what formed metal, resin, or metal and resin integrally is used. In order to secure strength required as mount, it is desirable to use a metallic material.
[0021]
However, if attachment and detachment are repeated when the mount surface is formed with the metallic material, the mount surface will be worn out as mentioned above, and the problem which impairs appearance grace according to an abrasion will occur. The wear becomes a cause, slidability is deteriorated, attachment-and-detachment torque becomes high, and there is a problem of an operation feeling becoming less good. For example, when using the aluminum containing alloy as mount construction material, it was lightweight and mount which is excellent in appearance grace and corrosion resistance might be able to be realized, but from a wear-resistant problem, if it remained as it is, it was not able to be used as construction material of mount.
[0022]
In order to secure abrasion resistance sufficient as mount, and slidability with a metallic material, it needed to process applying lubricant to the surface, using special materials, such as a sintered alloy which contained the lubrication component, etc., and had become a cause of cost increase.
[0023]
On the other hand, resin materials, such as POM, PEEK, PPS, and PTFE, have self lubricity, and even if they do not process applying lubricant to the surface etc., they have good slidability and the characteristic that abrasion resistance is maintainable. However, there is a problem that strength of a resin material is weak as compared with a metallic material. As for mount, it is desirable for a largely heavy telephoto lens to be attached, and also for various loads to be applied during photographing and carrying, and to secure strength as much as possible. There is a problem that a resin material is inferior to appearance grace to a metallic material. According to the mounting device of this embodiment described below, the problem mentioned above is solvable.
[0024]
(Working example 1)
Fig.1 is an example of the front view of an imaging device provided with the camera mount of this embodiment.
Fig.2 is a figure showing an example of the section of the camera mount part of the imaging device of the working example 1. In this embodiment, an imaging device is a camera with interchangeable lenses. And camera mount is a removable mounting device about a taking lens.
[0025]
In
Fig.1, when 1 removes a camera body and 13 removes a taking lens, it is a lens unlocking button to operate. 10 is the camera mount attached to the camera body 1. By two or more camera mount set screws 11a thru/or 11d, the camera mount 10 is fixed to the camera body 1.
[0026]
The base level of the lens mount 20 provided by the taking lens and 10 d of camera mount surfaces which oppose are formed in the surface of the camera mount 10. The details of the composition of 10 d of camera mount surfaces are mentioned later.
[0027]
The lens attachment indices 10e and 10f are provided by the position at camera mount surface 10d top 12:00, and the position at abbreviated 1:00.
[0028]
The camera mount 10 corresponds to the lens of two kinds of standards that standards differ. Two kinds of lens attachment indices of the lens attachment index 10e for lenses corresponding to the camera which has an image sensor of wide size in the camera mount 10, and the lens attachment index 10f for lenses corresponding to the camera which has an image sensor of narrow size are provided.
[0029]
The lens lock pin 12 is arranged at the position at 3:00 on the camera mount surface 10d. The lens lock pin 12 can be interlocked with the lens unlocking button 13, can move to 10 d of camera mount surfaces, and is energized in the direction projected from 10 d of camera mount surfaces. The three camera mount nails 10a, 10b, and 10c are formed in the inner periphery of the camera mount 10.
[0030]
The camera mount 10 comprises carrying out integrally the camera mount metal department 10j formed with metal, and the camera mount resin part 10k formed by resin. The resin material of the camera mount resin part 10k is construction material which is excellent in slidability, such as POM, PEEK, PPS, and PTFE, and abrasion resistance, for example. Such composition can be obtained by processing form beforehand by cutting etc. and carrying out insert molding of the camera mount resin part 10k to the camera mount metal department 10j which performed suitable heat treatment and surface treatment. It is also possible to create the camera mount resin part 10k separately molded to the camera mount metal department 10j press fit or by carrying out adhesion fixing.
[0031]
As shown in
Fig.2, the inner periphery of 10 d of camera mount surfaces is making the convex configuration, and the inner circumference rail (first rail) 10h is formed. The outer peripheral part of 10 d of camera mount surfaces is making the convex configuration, and 10 g of periphery rails (second rail) are formed. The inner circumference rail 10h is formed by the camera mount metal department 10j. The periphery rail 10g is formed by the camera mount resin part 10k.
[0032]
It is formed of the camera mount metal department 10j between the inner circumference rail 10h of 10 d of camera mount surfaces, and the periphery rail 10g, and it is making the mount surface concave part 10i. The rail level (first rail level) of the inner circumference rail 10h and the rail level (second rail level) of the periphery rail 10g are the same surface height, and form the surface which abuts with the base level of mount of a taking lens, and specifies a flange back. Thus, the portion which slides in the case of taking-lens attachment and detachment can be limited to a rail level by forming a rail level in 10 d of camera mount surfaces.
[0033]
The rail width of 10 g of periphery rail levels is formed more narrowly than the rail width of 10 h of inner circumference rail levels. As a result, it is possible to realize appearance grace where portions other than the periphery rail level where width is narrow will be formed with metal and which has a high grade feeling about the appearance of mount.
[0034]
Wearing of a taking lens is performed by inserting the lens mount 20 in the camera mount 10 together with the index with which camera mount corresponds the index position of a taking lens, making it abut the base level of the lens mount of a taking lens, and the base level of camera mount, and carrying out predetermined angle rotation of the lens. That is, the camera mount 10 and the lens mount 20 constitute the mount mechanism of a bayonet type.
[0035]
In a lens mounting state, the lens lock pin 12 engages with the lock hole provided by the predetermined position of the lens mount 20, and restricts rotation of a lens, and the camera mount nails 10a, 10b, and 10c engage with the claw part to which the lens mount 20 of a taking lens corresponds.
[0036]
Fig.3 is a figure showing the state where the nail 10c of camera mount was seen from the inside. Other nails 10a and 10b have the same composition. In
Fig.3, the spring member 14 is arranged on the back side of the camera mount nail 10c. The spring member 14 draws the claw part of the engaged lens mount 20, and it acts so that it may be made to abut the base level of mount of a taking lens, and the base level of camera mount.
[0037]
When removing a taking lens, it carries out by carrying out the depression of the lens unlocking button 13 of a camera by evacuating the lens lock pin 12 from 10 d of camera mount surfaces, and making the time of taking-lens wearing, and a counter direction rotate a predetermined angle taking lens.
[0038]
Fig.4 is a cross sectional view of the camera mount 10 at the time of the lens detaching operation in the working example 1, and the lens mount 20. As shown in
Fig.4, in the engaged claw part, backlash exists in the optical axis direction so that each can slide between the camera mount 10 and the lens mount 20.
[0039]
At the time of taking-lens attachment and detachment, a taking lens may incline slightly by backlash to camera mount owing to the bias of weight of a taking lens and a camera, and the power at the time of detaching operation, etc.
Fig.4 shows the state where the lens 21 leans downward. In that case, only the outer peripheral part of the camera mount 10 will contact [ a lens mount surface and ], and will slide.
[0040]
As mentioned above, since the periphery rail 10g is formed of the camera mount resin part 10k, only the rail level top which is the periphery rail 10g of resin will contact [ a lens mount surface and ], and the outer peripheral part of a mount surface will slide. Although a contact pressure and frictional force become high locally and wear advances easily in the state of contacting and sliding partially, according to the composition of this example, in this state, only the camera mount resin part 10k which is excellent in slidability and abrasion resistance contacts [ a lens mount surface and ], and slides. Therefore, it becomes possible to prevent wear of 10 d of camera mount surfaces.
[0041]
Where wearing of a taking lens is completed, a taking lens is drawn in an optical axis direction by the mount spring 14 by which the lens mount 20 is arranged at the three camera mount nails 10a, 10b, and 10c. Therefore, it will abut all over the rib of the periphery rail 10g on a camera mount surface, and the inner circumference rail 10h, and the base level of mount of a taking lens can hold a lens stably. According to the composition of this example, since the body part of camera mount containing the portion inside the outer peripheral part of a mount surface is formed with metal, it serves as mount with overall high rigidity.
[0042]
In the camera mount 10, the mount nails 10a thru/or 10c and the set screws 11a thru/or 11d receive all the loads of a taking lens. The lens lock pin 12 receives all the loads of the hand of cut of a taking lens. Since the hole is provided by the camera mount 10, the cross-sectional area of mount has decreased in the portion in which the set screws 11a thru/or 11d and the lens lock pin 12 were provided. Thereby, in camera mount, partial especially the part that is subject to high stress is the set screws [ 11a thru/or 11d ] neighborhood near the mount nails 10a thru/or 10c, and near the lens lock pin 12. Since according to the composition of this example each of these parts is included in the camera mount metal department 10j and it is formed with metal, strength is securable.
[0043]
As described above, since the metallic material of the camera mount metal department 10j bears strength required for camera mount, and rigidity, they can give priority to and choose slidability and the wear-resistant characteristic as a resin material of the camera mount resin part 10k. This has sufficient strength and camera mount which is excellent in the slidability of lens attachment and detachment and abrasion resistance can be realized. For example, harnessing the light weight of an aluminum containing alloy, and the outstanding appearance grace as construction material of the camera mount metal department 10j, if an aluminum containing alloy is adopted, it has sufficient strength and mount which is excellent in the slidability of lens attachment and detachment and abrasion resistance can be realized.
[0044]
(Working example 2)
Fig.5 is a cross sectional view of the camera mount at the time of the lens detaching operation in the working example 2, and lens mount. The fundamental composition of the camera mount of the working example 2 is the same as the composition described in working example 1. In the working example 2, as shown in
Fig.5, the surface height of the rail level of the periphery rail 10g formed in the resin part 10k of the camera mount 10 is formed more highly than other portions of 10 d of camera mount surfaces. Specifically, the plane height halfbeak of the rail level of the inner circumference rail 10h with which the surface height of the rail level of the periphery rail 10g formed in the resin part 10k was formed in the metal department 10k is also formed highly slightly. The periphery rail 10g formed in the resin part 10k forms the surface which abuts with the base level of mount of a taking lens, and specifies a flange back.
[0045]
Even when not only when the lens leans, but the lens does not lean at the time of lens detaching operation according to the camera mount of the working example 2, only the periphery rail 10g always formed in the resin part 10k contacts [ a lens mount surface and ], and slides. Thereby, if it becomes unnecessary for the metal department of a camera mount surface to take into consideration the tolerance over sliding of the surface and wear and the requirements for strength and a fine sight are satisfied, it will become possible to choose various construction material and a surface treatment. For example, the mount in which the decoration part of a mount surface does not get damaged even if it excels in appearance grace and repeats attachment and detachment of a taking lens by using aluminum **** which gave color alumite decoration to the metal department is realizable.
[0046]
As mentioned above, although described about the preferable working example of the present invention, the present invention is not limited to these working examples, but various deformation and change are possible for it within the limits of the summary.
[0047]
The present invention is realizable as any mounting device which makes first optical apparatus and second optical apparatus of each other detach and attach and which was provided by the first optical apparatus. Although the camera body of an imaging device functions as a first optical apparatus and a taking lens functions as a second optical apparatus in the working example mentioned above, a first optical apparatus may be a lens device and a second optical apparatus may be a camera body of an imaging device.
[Explanations of letters or numerals]
[0048]
1 Camera body
10 Camera mount
10 g Periphery rail
10 h Inner circumference rail
10k Camera mount resin part
20 Lens mount
