JPS63223736A - Single lens reflex camera - Google Patents

Abstract

PURPOSE:To improve an assembly operation by providing a motor for driving a focusing lens and a control circuit for said motor to a front body and a motor for winding and rewinding and a sequence control circuit for controlling the operation sequence of the respective parts of a camera to a rear body, respectively. CONSTITUTION:The motor 63 for driving the focusing lens and the control circuit 68 for said motor are provided to the front body FB of the camera body constituted by integrating the front body FB provided with a lens mount 51 on a front side and a mirror box on a rear side and the rear body BB provided with a cartridge chamber and spool chamber as well as an image plane frame formed between these two chambers. The motor for winding and rewinding and the sequence control circuit for controlling the operation sequence of the respective parts of the camera are provided to the rear body BB. Various operation checks can thus be executed by discretely driving the motors on the respective body sides before coupling of the front body FB and the rear body BB, by which the assembly accuracy is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a single-lens reflex camera equipped with an autofocus device, and in particular improves the mounting structure of various components.

B. Conventional technology The body of a single-lens reflex camera consists of a rear body consisting of a cartridge chamber for storing a magazine, a spool chamber for winding film, and a screen frame between these, and a front body consisting of a lens mount, mirror box, etc. It is made up of a combination of front and back. Many of the recent cameras that have an autofocus (hereinafter referred to as AF) device built into the camera body use a motor to automatically wind up and rewind the film and charge the mirror drive mechanism and shutter mechanism. Cameras of this type also have complex metering systems such as center-weighted metering or spot metering, and shutter priority linked to this system.

They are generally equipped with a variety of automatic exposure systems, such as aperture-priority auto, program auto, and auto-adjustable electronic flash systems.

Among the devices that operate these systems, the automatic winding and rewinding mechanisms and the shutter mechanism are generally housed in the rear body side mentioned above together with multiple motors that drive them, forming the rear body mechanism section. It is true. In addition, there is a movable mirror inside the mirror box that forms part of the front body, and a mirror drive mechanism on the outer periphery.
An AF lens drive mechanism and the like that move the camera lens in response to signals from the AF optical system and focus detection device are installed. Furthermore, the light-receiving element of the above-mentioned photometry system is also attached to the front body, and these components generally constitute the front body mechanism.

On the other hand, a power supply circuit 711 that supplies power to operate and control such a mechanism! ! A photometry circuit that controls the optical system, a sequence control circuit that controls the camera operating order, and an AF that determines the conditions of the focusing fermentation bottle and the post-bin condition and controls the amount of lens movement based on this judgment.
A conventional technique in which an electronic circuit such as a control circuit or a display circuit is provided will be described below with reference to the drawings.

FIG. 5 is a vertical cross-sectional view of the central part of a conventional auto-focus camera, showing a state in which the camera is ready for photographing.

In FIG. 5, a back cover 3 is attached to the back of the body T3B so that it can be opened and closed after the shutters 1 and 7 and the film 2 are housed. A mount 5 for attaching an interchangeable lens 75 is formed on the front surface of the front body FB, and a pentaprism 52a, a focus plate 52b, and an eyepiece 52c are mounted on the top.
A finder block 52 composed of two display elements 52d and a display mirror 52e is attached. Also,
A mirror box (not shown) is arranged near the optical axis, and a movable mirror 53 including a semi-transmissive part and a sub-mirror 55 that guides light transmitted through the semi-transmissive part to an AF optical block 54 are housed inside the box. On the support 50b provided on the floor of the mirror box 50a.

A holder 58 is provided whose position can be adjusted by a compression spring 56 and an adjustment screw 57, and an AF optical block 54 is provided on this holder 58. That is, in a general camera body, the adjustment screw 57 is screwed in and out to attach the holder 58.
The vertical position and attitude of the AF optical block 54 held in the AF optical block 54 are adjusted.

A focus detection element P (for example, C0D) 59 is bonded to the rear of the AF optical block 54. The flexible printed board 60 extends above the pentaprism 52a via the outer periphery of the mirror box, and transfers the output of the CCD 59 to the CPU 62 on the printed board 61. The CPU 62 is
The output information of the D59 is arithmetic processed and AF multiplied signals of in-focus, front bin, rear bin, etc. are output. Floor surface 50a of mirror box
An AF motor 63 is provided behind the lens, and is driven by the AF multiplication signal to move the lens 64 to the in-focus position. In addition, the aforementioned photometry circuit, sequence control circuit, power supply circuit 2 display circuit, etc.

It is provided on the upper part of the camera body around the pentaprism, that is, on the front body FB.

The front body FB and the rear body BB, on which the above-mentioned parts are mounted, are connected by screws 21 to form the camera body main body. It is being said.

C0 Problems to be Solved by the Invention However, in this conventional camera, the AF circuit, sequence control circuit, and power supply circuit are attached to the front body FB, and the AF motor 63.
Rear body B B &: Attachment (not shown) The winding, rewinding motor, charging motor, etc. are connected to each of the above circuits in the final step, that is, after the front and rear bodies are connected.

Therefore, in the previous process, it was not possible to drive each motor, which caused problems in terms of assembly work efficiency. An object of the present invention is to provide a single-lens reflex camera with improved assembly workability.

D. Means for Solving the Problems Explained based on FIG. 1 showing an embodiment of the problem, the single-lens reflex camera according to the present invention includes a front body FB having at least a lens mount 51 on the front side and a mirror box on the rear side; A rear body BB comprising at least a patrone chamber, a spool chamber, and a screen frame formed between these two chambers.
Equipped with a camera body integrated with the front body FB
is provided with a focusing lens drive motor 63 and its control circuit 68, and the rear body BH is provided with winding/rewinding motors 16, 20 and a sequence control circuit 19 for controlling the operating order of each part of the camera. It is something that

81 Before combining the front body FB and rear body BB, the motors on each body side can be driven individually to check various operations.
Improves assembly workability.

F. Embodiment FIGS. 1 to 4 show an embodiment in which the present invention is applied to a finder-exchangeable single-lens reflex camera.

The same parts as in FIG. 5 will be described with the same reference numerals.

(1) Front body FB At the top of the front body FB, a condenser lens 65a,
A screen unit 65 consisting of a focus plate 65b and a screen case 65c that holds these is housed, and a display element 66 that receives signals from the AF circuit and displays focus is arranged in front of this housing. The focus display by the 0 display element 66 is performed by the finder 41, which will be described later.
As shown in the figure, the light is guided to the finder eyepiece section 42 by a mirror 41d inside. Also, the front body FB
A lens mount 51 for attaching an interchangeable lens 75 is provided in front of the lens mount 51, as in the conventional case, and a mirror box 71 (not shown in FIG. 2) is arranged at the center of the front body behind the lens mount 51. Inside this mirror box, there is a movable reflecting mirror 53 that has a semi-transparent part on a part or the entire surface, and behind it, there is a sub-mirror 56 that guides the light transmitted through this reflecting mirror 53 to the AF optical block 54, as in the conventional case. It is stored in. Further, on the back side of the mirror box floor 50a, an AF optical block 54 is provided so that its position and attitude can be adjusted as in the conventional case, and an AF motor 63 for driving a lens 64 is arranged. AF motor 63
A coupling 67 is provided at the tip of the shaft to be connected to a power transmission system 66 on the lens side.

Further, an AF circuit board 68 is provided below the AF optical block 54.
is screwed onto the support column 78 of the front body FB shown in FIG. A CPU 76 is provided on the AF circuit board 68 to control all the AF display devices, and receives signals from the CCD 59 to determine focus, front focus, and rear focus, and accordingly sends a drive signal to the AF motor 63. and outputs a goldfish signal to the display drive circuit of one display element 66.

Note that all of the electronic circuits for the AF device are arranged on this AF circuit board 68. The AF circuit board 68 and CCD 59 are connected by a short flexible printed board 69.

As shown in FIG. 2, by utilizing the flexibility of the flexible printed board 69, the AF circuit board 68 is left open without being screwed onto the front body FB, and a plurality of screws 57 are screwed in and out to fix the AF. By adjusting the position and attitude of the optical block 54, there is no need to drill a tool hole in the AF circuit board 68 for turning the screw 57, and a wide mounting space for the AF circuit board 68 can be secured. If there is enough mounting space, make an adjustment hole on the AF circuit board 68 and insert the AF circuit board 6.
The AF optical block 54 may be adjusted while the lens 8 is attached to the front body FB with screws. With this configuration, just by connecting the power line to the AF circuit board 68,
It is possible to adjust the AF circuit and check the operation of the entire AF device with the front body alone.

(■) Rear body BB Next, the rear body BB will be explained with reference to FIG. 3 as well.

The rear body BB has a patrone chamber P defined by an outer wall 11.
R, a spool chamber SR defined by an outer wall 12, and a screen frame 13 formed between these are integrally constituted. A shutter unit 14 for opening and closing the screen frame 13 is attached to the screen frame 13, and its drive is controlled by a shutter mechanism section 15. Reference numeral 16 denotes a winding motor disposed near the spool chamber outer wall 12, the output of which is connected to the winding mechanism section 1-7 disposed at the upper part of the spool chamber.
The rotation of the film winds the film and charges the shutter mechanism 15. Although omitted here to make the drawing easier to understand, there is a film rewind motor 20 and its motor 20 around the outer wall 11 of the cartridge room.
A mechanism section that is driven by and rewinds the film is disposed.

Further, a column 18a is provided on the lower surface of the spool chamber, and a column 18b is provided on the lower surface of the cartridge chamber, and a rib 18 is provided between these columns.
It is connected at 8c. This rib 18e maintains the rigidity of the rear body BB, and significantly improves the strength of the entire camera body when combined with the front body FB. Furthermore, a sequence board 19 is attached to the lower surface of the rib 18c, and the winding motor 16.
It is connected to the rewind motor 20 and the shutter mechanism section 15. This sequence board 19 includes a CPU 20 (FIG. 1) that constitutes a camera sequence control circuit.

Power supply circuits etc. are located here.

Therefore, during assembly, it is possible to check the winding and rewinding operations of the camera, the operation of the shutter mechanism, and adjust the operation sequence using the rear body alone.

Both the front and rear body FBs have various parts mounted as described above.
, BB after performing various adjustment work for each body,
The camera body is assembled by a plurality of screws 21. When the front body and rear body are assembled in this way, the AF circuit board 68 is housed in the space surrounded by the pillars 18a, 18b and ribs 3-8p.

The AF circuit board 68 is connected to the AF circuit board already provided on the front body FB side.
Since it is connected to the motor 63 etc. so that the AF device can operate, several wires such as a sequence signal line and a power line for instructing when to operate the AF device are connected to the sequence board 19. All you have to do is
Since the AF circuit board 68 and the sequence board 19 are adjacent to each other with the rib 18C in between, this wiring can be made extremely short, making it difficult for electrical noise to enter.

Finally, the exchange finder 41 is removably attached to the upper part of the camera body that has been integrated in this way and has been finished with various wiring. The exchange finder 41 is constructed by housing a pentaprism 41b, an eyepiece 41c, and a mirror 41d of a display optical system inside a finder cover 41a. The exchange finder 41 shown in FIG. 1 is the most common eye level finder, but other types include a waist level finder and an X magnification finder.

Interchangeable finders such as action finders can be replaced and installed depending on the purpose of photography.

According to the embodiment described above, the following effects can be obtained.

b) Since the AF circuit board and sequence board are placed in the space at the bottom of the camera, there is plenty of space around the pentaprism at the top of the camera, making it possible to accommodate larger packaging in the future. Note that if this space is removed, the AF camera can be made smaller.

Since the electronic circuit is mounted in the space at the bottom of the camera, which was previously not used, the space inside the camera can be used without wasting it, allowing for a rational mounting arrangement.

c) Since the AF optical block and various electronic circuits are arranged close to each other, an AF camera with high reliability against noise can be realized.

2) Since the AF circuit board is separately arranged in the front body section and the sequence board is arranged separately on the bottom side of the rear body section, the front body and the rear body can be adjusted as a single unit, improving workability.

e) When the present invention is applied to an AF camera with an interchangeable finder, there is no connection between the finder and the camera body, so a highly reliable AF camera with an interchangeable finder can be realized.

f) A rib is suspended from two pillars on the rear body side, and two circuit boards are placed in the inner and outer spaces of the rib, allowing for high-density mounting in a small amount of space. It can improve the rigidity of the body.

g) Even though the AF circuit board was placed under the AF optical block, the two were connected with a flexible printed board so that the AF circuit board opened to the rear of the front body, so it was difficult to insert the adjustment tool into the AF circuit board. The AF optical block can be adjusted without having to make any holes.

G6 Effects of the Invention According to the present invention, the AF motor and the AF circuit board are mounted on the front body, and the winding and return motors and the sequence board are mounted on the rear body.
Before joining B, the motors on each body side can be driven individually to check various operations, improving assembly work efficiency.

[Brief explanation of drawings]

FIGS. 1 to 4 show one embodiment, in which FIG. 1 is a central sectional view of the camera, and FIG. 2 is a perspective view of the front body. FIG. 3 is a central sectional view of the front body, and FIG. 4 is a perspective view of the rear body. FIG. 5 is a central sectional view of a conventional AF camera. 1: Shutter 2: Film 3: Outside wall of cartridge room 12 Outside wall of varnish spool room 13: Screen frame 14: Shutter unit 15: Shutter mechanism section 16 2 Winding motor 19 Nijiken board 18a, 18
b: Post 18c: Rib 41: Replacement finder 5
1: Lens mount 54: AF optical block 58: Holder 59: CCD 63: AF motor 6
4: Lens 68: AF circuit board 69: Flexible printed circuit board Patent applicant Nippon Kogaku Kogyo Co., Ltd. Representative Patent Attorney Noriko Nagai

Claims (1)

[Claims] A front body that includes at least a lens mount on the front side and a mirror box on the rear side, and a rear body that includes at least a cartridge chamber, a spool chamber, and a screen frame formed between these two chambers are integrated. In a single-lens reflex camera equipped with a camera body, the front body is equipped with a focusing lens driving motor and its control circuit, and the rear body is equipped with a winding and rewinding motor and an operating order of each part of the camera. A single-lens reflex camera characterized by being provided with a sequence control circuit for controlling each.