JPH09179183A - Body frame structure for back focus control type af camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide body frame structure for a back focus control type AF camera whose assembly on an assembling line is facilitated, where adjustment in the case of mounting an operating member is simplified, by which the inside of the camera is not deformed even when abnormal external force is exerted, and which has strength high enough to maintain accurate AF control for a movable body. SOLUTION: The outer front case A1 and the outer rear case A2 of the fixed body are assembled from front and back in a state where they house the movable body B inside. The edges of the upper left and right reinforcing bases 5 and 4, the upper left and right reinforcing frames 7 and 8 and the lower left and right reinforcing frames integrally formed at the ends of the lower left and right reinforcing bases of the case A2 are butted on the case A1 and screwed to be fixed. An upper cover and a lower cover are attached from the back.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a body frame structure of a back focus control type AF camera, and more specifically, a movable body having a photographing function is incorporated in a fixed body including an outer case so as to be movable in the optical axis direction. It relates to a body frame assembly consisting of.

[0002]

2. Description of the Related Art AF using a conventional manual lens
The back focus control type AF camera that can shoot is
It has a fixed body including a lens mount for photographing and an outer part that forms the appearance of the camera, and shooting functions such as a finder mechanism, a distance measuring mechanism, an exposure mechanism and a film feeding mechanism, and moves in the optical axis direction in the fixed body. It is configured by incorporating a movable body that can be moved. Therefore, unlike an ordinary single-lens reflex camera in which a shooting function portion does not move and which can be formed as an integral body structure, it is necessary to consider the strength of the camera when forming a fixed body and a movable body. This is because the movable body portion does not directly contribute to the strength of the camera body, and therefore, when an external force is applied, the photographing function may be directly affected. In addition, it is necessary to have a built-in structure in which the movable body slides in the optical axis direction in the fixed body with high precision and does not hinder the focusing movement.

Therefore, the applicant of the present application has proposed a structure of an outer case suitable for a back focus control type AF camera (Japanese Patent Application No. 5-254315, title of the invention, outer case of a back drive type automatic focusing camera). This outer case has a structure in which the movable body is completely housed in a fixed body including the outer part, and a part of the movable body that moves by AF control is not exposed to the outside. There is no obstacle to movement. Further, the outer case itself has parts corresponding to the upper cover and the lower cover part, and the shell itself of the outer case and the upper and lower cover parts maintain rigidity of the camera to cope with external force applied to the camera.

[0004]

By the way, in consideration of the work efficiency in the assembling work of the camera, it is essential that the contents of the camera assembly are clearly visible. However, the outer case proposed above accommodates the movable body in a fixed body in which the front surface, the rear surface, the upper surface and the lower surface are integrated,
The inside is a structure that can be seen only from a limited part, which is inconvenient for assembly. Further, for example, although an operation member such as a dial is attached to the upper cover, a hole for attaching the operation member is provided in the outer casing of the fixed body, and the end portion of the operation member is attached to a member in the camera. If there is a deviation, there is little room for adjustment, so it is necessary to improve the relative positional accuracy between the hole provided in the outer case and the member in the camera.

Further, when an abnormal force is applied from the lens or the back side for some reason, there is a possibility that an abnormal force is also applied to the outer case. In such a case, maintaining the strength of the camera with the shell of the outer shell is not sufficient for the camera that moves the opening surface of the movable body with respect to the lens mount with high accuracy. This is because it cannot be said that when an external force is applied, the flange back is slightly deviated and AF control is not hindered. An object of the present invention is to be easily incorporated in an assembly line, to be easily adjusted with respect to the attachment of an external operation member, and to prevent deformation inside the camera even when an abnormal external force is applied. Provided is a body frame structure of a back focus control type AF camera having sufficient strength to maintain accurate AF control of a movable body.

[0006]

In order to solve the above-mentioned problems, the body frame structure of a back focus control type AF camera according to the present invention comprises a fixed body including a lens mount for photographing and an outer portion forming the appearance of the camera. A movable body that has a photographing function such as a finder mechanism, a distance measuring mechanism, an exposure mechanism, and a film feeding mechanism and is movable in the optical axis direction inside the fixed body is provided, and a film opening surface of the movable body is moved by a drive mechanism. In a back focus control type auto-focus camera for bringing the focus position, the outer shell is divided into an outer shell front case and an outer shell rear case, and the outer shell front case is a structure mainly including a front surface portion including a mount base. The rear case has a structure mainly including a rear surface portion including a back cover, and is different from the front front case or the rear rear case. The movable body, which has a reinforcing frame for maintaining a constant distance from the outer casing, and is equipped with a rail mechanism for guiding in the optical axis direction, is housed between the outer casing front case and the outer casing rear case. A camera is provided by supporting both ends of the rail mechanism by the outer front case and the outer rear case, and abutting the reinforcing frame on another outer case to connect the side portions of the outer front case and the outer rear case. An upper cover and a lower cover are attached to form an assembly and cover the upper surface and the lower surface of the camera later. Further, in addition to the above-described configuration, the present invention is provided with a reinforcing base for mounting a substrate on which an operating device such as a dial arranged on the upper cover or the lower cover is mounted, in the front case or rear case. Further, in addition to the above configuration, the present invention is configured such that the reinforcing base is provided with a plurality of mounting seats and the substrate is fixed to the mounting seats.

[0007]

According to the above construction, the reinforcing frame can obtain sufficient strength against an external force applied between the front case and the rear case, and the influence of the external force on the photographing function can be eliminated. Further, since the upper cover and the lower cover are separately attached later, the inside of the camera including the movable body can be easily seen from the upper side and the lower side, and the assembling work becomes easy. Further, the adjustment of the attachment of the operation member provided outside can be performed regardless of the outer case, so that the positional accuracy for the attachment of the dials is not particularly required.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of a body frame structure of a back focus control type AF camera according to the present invention. (A) is a rear case of an outer shell, (b) is a movable body, and (c) is an outer shell. The previous cases are shown respectively. FIG. 2 is a plan view showing a state in which the outer rear case, the movable body, and the outer front case shown in FIG. 1 are assembled. FIG. 3 is a cross-sectional view taken along the line AA in FIG. 6, where (a) shows the outer shell rear case, (b) shows the movable body, and (c) shows the outer shell front case. FIG.
FIG. 4 is a plan view showing a state in which the outer shell rear case, the movable body and the outer shell front case shown in FIG. 3 are assembled. FIG.
[Fig. 3] is a diagram showing an embodiment of an outer shell front case, (a) is a front view, (b) is a left side view, and (c) is a right side view.

6A and 6B are views showing an embodiment of a rear case of an outer shell, wherein FIG. 6A is a front view, FIG. 6B is a left side view, and FIG.
Shows the right side view, respectively. A movable body B is provided between the fixed body front case A1 and the rear case A2.
It is designed to be housed and incorporated. In FIG. 1 and FIG. 5, the outer shell front case A1 has a mount base 3 integrated with it, and has a substantially front surface configuration only. The front surface portion has a structure in which a left front surface portion 16 and a right front surface portion 17 are formed on both sides of the mount base 3, and the left front surface portion 16 and the right front surface portion 17 are provided on the left side portion 14 of the rear case A2. Receiving portions 16a and 17a for fitting with the fitting portion 14a and the fitting portion 15a of the right side portion 15 are provided.

Further, through holes 9a and 10a facing metal screw portions 7a and 8a (see FIG. 6) embedded in the tips of the upper left reinforcing frame 7 and the upper right reinforcing frame 8 of the outer rear case A2 are provided. Has been. Further FIG.
As shown in FIG. 5, through holes 27a and 28a are provided to face the metal screw portions 29a and 30a (see FIG. 6) embedded in the tips of the lower left reinforcing frame 29 and the lower right reinforcing frame 30. On the other hand, the outer case A2
The back cover 6 is attached by a hinge 6a, and is generally constituted by the rear surface portion and the side surface portion. A fitting portion 14a is provided at the tip of the left side portion 14, and a fitting portion 15a is provided at the tip of the right side portion 15. An upper left reinforcing base 5 and an upper right reinforcing base 4 are provided from the left side portion 14 and the right side portion 15 of the outer rear case A2 to the rear surface portion. An upper left reinforcing frame 7 is integrally formed on one end side of the upper left reinforcing base 5, and an upper right reinforcing frame 8 is integrally formed on one end side of the upper right reinforcing base 4.

On the upper left reinforcing base 5, the upper left reinforcing frame 7, the upper right reinforcing base 4 and the upper right reinforcing frame 8, there are mounting seats 5a, 5b, 5 for fixing a board or the like.
c, 7b, 7c, 4a, 4b, 8b and 8c are provided. In addition, as shown in FIG. 3, a lower left reinforcing base 20 integrally formed with a lower left reinforcing frame 29 and a lower right reinforcing base 30 in which a lower right reinforcing frame 30 is provided under the outer rear case A2. 21 is provided.
The upper left reinforcing frame 7 and the upper right reinforcing frame 8 define the distance between the outer shell front case A1 and the outer shell rear case A2, and strengthen the strength together with the upper left reinforcement base 5 and the upper right reinforcement base 4. Further, the lower left reinforcing frame 29 and the lower right reinforcing frame 30 also define the distance between the front case A1 and the rear case A2, like the upper left reinforcing frame 7 and the upper right reinforcing frame 8. The strength is reinforced together with the base 20 and the lower right reinforcing base 21.

The movable body B is equipped with a mirror box for accommodating the mirror 13, a pentaprism 1 constituting a finder mechanism, a film feeding mechanism including a spool chamber 22 and a cartridge chamber 23, and the like. In the lower part of the movable body B, a guide hole 11a (see FIG. 7) for sliding the linear rail 11 that guides in parallel to the optical axis during AF control and a guide rail 12 that prevents the movable body from rotating during movement are provided. It has a sliding guide hole (not shown). One end of the linear rail 11 is in a support hole 11b provided in the lower part of the front case A1 of the outer shell, and the other end is in the rear case A of the outer case A1.
2 are inserted into and supported by the support holes 11c provided in the lower part of the reference numeral 2, respectively. In addition, the guide rail 12
One end of the same is inserted into and supported by a support hole 12b (not a through hole) also provided in the lower portion of the front case A1 and the other end is inserted into and supported by a support hole 12c provided in the lower portion of the rear case A2 of the outer case. Has become.

FIG. 7 is an exploded vertical sectional view of a back focus control type AF camera to which the body frame structure according to the present invention is applied. The rear case, movable body, front case, upper cover and lower cover are disassembled and shown. In the guide hole 11a of the movable body B equipped with each function,
The linear rail 11 is inserted, and the guide rail 12 is also inserted into a guide hole (not shown). Then, the front outer case A1 and the rear rear case A2 are arranged in front of and behind the movable body B, and are assembled. Outer case A
1 and the rear case A2 are fixed by the rear case A
The fitting portions 14a, 15a of No. 2 are fitted into the receiving portions 16a, 17a of the front case for outer shell A1, and the screws are passed through the through holes 9a, 10a, 27a, 28a of the front case for outer shell A1, and the metal screw parts of the rear case for outer shell A2. 7a, 8a, 29a and 30
Screw to a.

Both ends of the linear rail 11 are case A in front of the outer shell.
The support hole 11b of No. 1 and the support hole 11c of the rear case A2 are fitted and supported. Similarly, the guide rail 12 is also fitted and supported in the support holes 12b and 12c (see FIGS. 3, 5 and 6). FIG. 8 is a vertical cross-sectional view showing a state in which the outer rear case, the movable body, the outer front case, the upper cover and the lower cover of FIG. 7 are incorporated. Cell case 25 to prevent the linear rail 11 and guide rail 12 from falling off.
And a lower cover 26 is attached from above. Similarly, an upper cover 24 is attached to the upper part.

FIG. 9 is a partial view for explaining the built-in structure of the dial operating device. Before the upper cover 24 is covered, the board base 41 having the switches 43 and 44 for mode switching and exposure correction on the mounting seats 5b, 5c and 7b of the upper left reinforcing base 5 and the upper left reinforcing frame 7 is screwed. To be done. Similarly, the board base 42 having the switches 45 for setting the shutter speed and the like attached thereto is screwed to the mounting seats 4b, 8b of the upper right reinforcing base 4 and the upper right reinforcing frame 8. Next, the upper cover 17 is put on and fixed. Further, dial portions 38, 39 and 40 are fixed to the shafts of the switches.

FIG. 10 is a schematic view for explaining the arrangement of each mechanical portion in the camera body. At each part of the movable body B, there are a mirror box unit 38, a film winding unit, a shutter charge unit 41, a mirror quick return unit 42, a one-rotation limiting unit 43, an AF distance measuring unit 45, a dimming unit 32, and a rewinding unit 35. It is installed. An AF drive unit 31, an aperture control unit 34, dial units 37 and 39, and a lithium battery 4 as a power source are provided on the fixed body side.
4 are arranged, and further electrical mounting spaces 33, 36, 4
A board on which an IC or the like is mounted and electric parts are arranged with 0 secured.

[0017]

As described above, according to the present invention, in the back focus control type autofocus camera, the front case and the rear case are divided into the front case and the front case.
The front part including the mount base is the main structure, and the outer rear case is mainly the rear part including the back cover, and the distance between the outer front case and the outer rear case is constant. A reinforcement frame for holding the camera body is installed, and the movable body is housed during assembly and the reinforcement frame is struck against another outer case so that the front case of the outer case and the side parts of the rear case are connected to form a camera body assembly. Since it is configured to, even if an abnormal external force beyond the normal force is applied between the front case and the rear case, there is almost no deformation inside the camera and sufficient strength must be secured. You can Therefore, accurate AF control of the movable body can be maintained, and the influence of external force on the photographing function can be eliminated.

Further, since the outer cover of the fixed body is structured such that the upper cover and the lower cover are separately mounted and attached later, the inside of the camera including the movable body can be directly viewed from the upper side or the lower side. Work becomes easy. Furthermore, the front case or outer case is provided with a reinforcing base for mounting a board for mounting an operating device such as a dial arranged on the upper cover or the lower cover. The accuracy of installation is not required, and the effect of facilitating the adjustment of the installation of the operating member provided outside is provided.

[Brief description of the drawings]

1A and 1B are plan views showing an embodiment of a body frame structure of a back focus control type AF camera according to the present invention, wherein FIG. 1A is a rear case of an outer shell, FIG. 1B is a movable body, and FIG. The previous cases are shown respectively.

FIG. 2 is a plan view showing a state in which a rear case, a movable body and a front case of the back focus control type AF camera according to the present invention are assembled.

3A and 3B are cross-sectional views taken along the line AA, in which (a) shows a rear case of the outer shell, (b) shows a movable body, and (c) shows a front case of the outer shell.

FIG. 4 is an assembly view of a rear case, a movable body, and a front case shown in FIG.

FIG. 5 is a diagram showing an embodiment of an outer shell front case, (a)
Shows a front view, (b) shows a left side view, and (c) shows a right side view.

FIG. 6 is a view showing an embodiment of a rear case of the outer shell, (a)
Shows a front view, (b) shows a left side view, and (c) shows a right side view.

FIG. 7 is an exploded vertical sectional view of a back focus control type AF camera to which a body frame structure according to the present invention is applied.

8 is a vertical cross-sectional view showing a state in which the outer rear case, the movable body, the outer front case, the upper cover and the lower cover of FIG. 7 are assembled.

FIG. 9 is a partial view for explaining a built-in structure of the dial operation device.

FIG. 10 is a schematic diagram for explaining the arrangement of each mechanical portion in the camera body.

[Explanation of symbols]

 A1 ... front case of outer shell A2 ... rear case of outer shell B ... movable body 1 ... penta prism 2 ... mirror box 3 ... mount base 4 ... upper right reinforcing base 5 ... upper left reinforcing base 6 ... back cover 7 ... upper left reinforcing frame 8 ... Upper right reinforcing frame 11 ... Linear rail 12 ... Guide rail 13 ... Mirror 20 ... Lower left reinforcing base 21 ... Lower right reinforcing base 24 ... Upper cover 25 ... Cell case 26 ... Lower cover

Front page continued (72) Inventor Hirotaka Castle 2-14-9 Tamagawadai, Setagaya-ku, Tokyo Kyocera Corporation Tokyo Yoga Works (72) Inventor Tsuyoshi Okutani 2-14-9 Tamagawadai, Setagaya-ku, Tokyo Kyocera Corporation Tokyo Yoga Works

Claims (3)

[Claims] 1. A fixed body including a photographing lens mount and an outer portion that forms the appearance of a camera, and a photographing function such as a finder mechanism, a distance measuring mechanism, an exposure mechanism, and a film feeding mechanism, and the inside of the fixed body. In a back focus control type autofocus camera having a movable body movable in the optical axis direction and bringing a film opening surface of the movable body to a focal position by a drive mechanism, the outer shell is divided into a front shell case and a rear shell case. The outer shell front case has a structure mainly including a front surface portion including a mount base, and the outer shell rear case has a structure mainly including a rear surface portion including a back cover, and the outer shell front case or the outer shell rear case. Has a reinforcing frame to keep a constant distance from other outer case, and is equipped with a rail mechanism to guide in the optical axis direction. The movable body is housed between the outer shell front case and the outer shell rear case, both ends of the rail mechanism are supported by the outer shell front case and the outer shell rear case, and the reinforcing frame is abutted on another outer shell case. A back focus, characterized in that a camera assembly is formed by connecting the side portions of the front case and the rear case, and an upper cover and a lower cover are attached to cover the upper and lower surfaces of the camera later. Control method AF camera body frame structure. 2. A reinforcing base for mounting a substrate on which an operation device such as a dial arranged on the upper cover or the lower cover is mounted, in the front case or the rear case. The body frame structure of the back focus control type AF camera described in 1. 3. A plurality of mounting seats are provided on the reinforcing base,
The back focus control method A according to claim 2, wherein the substrate is fixed to the mounting seat.
F camera body frame structure.