JP2686251B2 - Single-lens reflex camera - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-lens reflex camera, and more particularly to a single-lens reflex camera having a mirror means for guiding a light beam passing through a photographing lens to a finder optical system. is there. 2. Description of the Related Art In recent years, in a camera or the like, a large number of flexible printed circuit boards and the like are generally used for arranging various electric components and the like for performing operations such as photometry and distance measurement at a high density. Has been applied to For example, in the mounting structure of the flexible printed circuit board of the camera disclosed in Japanese Patent Laid-Open No. 62-141525, a plurality of flexible printed circuit boards are mounted on the camera body side. In the single-lens reflex camera disclosed in Japanese Unexamined Patent Publication No. 56-25718, a flexible print is formed along the upper surface of a pentagonal roof prism (hereinafter abbreviated as a pentaprism) of a finder optical system. An electric board of a photometric system such as a board is arranged. On the other hand, in recent years, the internal structure of a camera or the like is divided into a plurality of units and blocks having various functions, and these units are electrically connected by a flexible printed circuit board or the like. The configured one is put to practical use. However, according to the means disclosed in the above-mentioned Japanese Patent Laid-Open No. 62-141525, as the number of flexible printed circuit boards arranged inside the camera increases, the assembly becomes easier. There is a problem that it becomes difficult. Therefore, it is considered that the number of steps and the manufacturing cost will increase. According to the means disclosed in Japanese Patent Laid-Open No. 56-25718, an electric substrate is arranged above the pentaprism. This electric substrate is part of the camera body. Since more electric boards including the pentaprism portion can be assembled in the camera body, there is a problem that it takes time and effort during assembly. On the other hand, inside a camera or the like, a unit is formed for each function, and each of the plurality of units is
For example, when checking electrical functions (operation check, quality check, etc.), it is inefficient to check the function and performance of each unit while it is built into the camera body. Conceivable. That is, specifically, for example, an AF provided in a mirror box unit which is a single unit.
When confirming the functions and performances related to (auto focus), after confirming after assembling this mirror box unit into the camera body and as a result, it is found that this is defective, This means that the mirror box unit (defective product) must be removed from the camera body again. This leads to an increase in man-hours, which leads to an increase in manufacturing cost and is considered to be extremely inefficient. An object of the present invention is to solve the above-mentioned conventional problems, to disperse the flexible printed circuit boards arranged in the camera, and to provide the flexible printed circuit boards in the mirror box unit, thereby facilitating the assembling work and increasing the number of assembling steps. It is an object of the present invention to provide a single-lens reflex camera in which the manufacturing cost is suppressed and the repairability is improved by reducing the noise. A single-lens reflex camera according to the present invention has a mirror means for guiding a light flux passing through a photographing lens to a finder optical system and is detachably attached to a camera body unit. Mirror box unit, a first flexible printed circuit board connected to the mirror box unit, and a second flexible printed circuit board connected to a unit other than the mirror box unit and the first flexible printed circuit board. A flexible printed circuit board, wherein the first flexible printed circuit board and the second flexible printed circuit board are provided.
It is characterized by having a contact connected when assembled with the mirror box unit to the camera main unit. BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is an assembled front view of a camera to which an embodiment of the present invention is applied. In FIG. 1, a flexible printed circuit board (hereinafter abbreviated as FPC).
Reference numeral 17 is fixed to the inner side surface of the upper plate 11 by a fixing screw 10 via a reinforcing plate 15 or the like. Touch switch 19 for inputting information, liquid crystal display panel 12, anisotropic conductive rubber 1
3 and the like are attached to the FPC 17 by mechanical compression with a copper foil portion subjected to conductive plating.
An electric contact for strobe (hereinafter abbreviated as a strobe contact) 16 penetrates a hole provided in the FPC 17,
It is soldered to a copper foil portion provided around this hole. The liquid crystal driver I is installed on the FPC 17.
Electrical components 14 such as a C, a clock, and a strobe control circuit are mounted. Further, the FPC 17 has a movable portion 18 that can freely move from the upper plate 11, and a substrate connecting portion 24 described later is provided at an end (hereinafter, referred to as a movable end) 18A of the movable portion 18. ing. On the other hand, in addition to the above-mentioned upper plate unit 20, there is a main body unit 30 in which an FPC 32 is arranged on a camera main body 31. Electrical components such as a CPU (Central Processing Unit) 34 and an IC 35 are mounted on the FPC 32. The FPC 32 of the main body unit 30 is also provided with a board connecting portion 39 described later at one end 32A thereof. A control circuit for transmitting and receiving signals from the upper plate unit 20 and performing power supply and control on the main unit 30 side is provided in the camera main unit 31. This control circuit includes a power supply device (not shown), a DC-DC converter, a control IC,
The signal line, which is composed of an EEPROM or the like, for transmitting and receiving a control signal to and from the upper plate unit 20 is the FPC.
32 are connected by a board connecting portion 39 at an end portion 32A. The upper plate unit 20 and the main body unit 3
A connecting device 40 is used to connect the camera to the camera during the camera assembly process. The connection device 40 electrically and mechanically connects the board connection portions 24 and 39 to each other with the movable end 18A of the FPC 17 and the end 32A of the FPC 32 interposed therebetween, as shown in an enlarged manner in FIG. The pedestal 41, the elastic member 42, the holding plate 43, and the screw 4
Consists of four. The pedestal 41 is fixed to the camera body 31 with screws 45 (see FIG. 1). On the upper surface of the pedestal 41, a disk-shaped convex portion 41a is formed.
A boss 41b having a screw hole 41bb is formed at the center of a. A positioning boss 41c is provided near the convex portion 41a.
Are formed. The elastic member 42 is a ring fitted to the boss 41b of the pedestal 41, and the pressing plate 43 is fitted to a hole 43a fitted to the boss 41b similar to the elastic member 42 and the positioning boss 41c. Hole 4
3b. Ends 18A, 32 of the FPCs 17, 32
As shown in FIG. 2, the structure of each of the board connecting portions 24 and 39 of A is such that a hole 21 in which the boss 41b fits and a hole 22 in which the positioning boss 41c fits are formed in the movable end 18A. Further, similar holes 36 and 37 are formed in the end 32A. Then, in order to electrically connect the FPCs 17 and 32, the respective insulating films are peeled in a ring shape in advance around the holes 21 and 36 on the mutually opposing surfaces of the ends 18A and 32A, and a copper foil is formed. Parts
The exposed copper foil portions (hatched portions) are plated with gold to form electric contact patterns 23 and 38. Therefore, the FPCs 17 and 32 are connected to the end 1
8A and 32A, the electrical contact patterns 23 and 38 are brought into contact with each other and the end portions 18A and 32
A is overlapped, and the boss 41b is inserted into the holes 21 and 36 in this state.
The bosses 41c are fitted into the holes 22 and 37, respectively, to position the ends 18A and 32A on the pedestal 41. Thereafter, the hole 43a of the holding plate 43 is fitted into the boss 41b projecting from the hole 21 via the elastic member 42, and
The hole 43b of the holding plate 43 is fitted to the boss 41c that projects further. Finally, the screw 44 is screwed into and fixed to the screw hole 41bb at the upper end of the boss 41b which is fitted and positioned in the hole 43a of the pressing plate 43. The head of the screw 44 is the boss 41
b are fixed to the upper end surface so that the end portions 18A, 32
A, the elastic member 42, and the holding plate 43 are in close contact with each other in a state where they are prevented from being removed from the boss 41b.
3 and 38 are electrically connected reliably. Since the elastic member 42 is interposed, a uniform pressing force can be obtained between both ends 18A and 32A.
An extremely stable conduction state can be obtained between 8. If another end of another FPC is superposed on the movable end 18A of the FPC 17 to establish electrical connection with each other, electrical contacts are provided on both sides of the end of the movable end 18A. A pattern may be formed. In this way, even when a plurality of FPCs are connected, the electrical connection between the FPCs is stably performed, and the number of electrical contact patterns formed on one surface is, for example, the electrical contact pattern having a diameter of 6 mm. In this case, about 12 contacts are possible (see FIG. 2).
(Electric contact patterns 23 and 38 shown in FIG. 6 have six contacts.) When three FPCs are overlapped, 24
The electrical connection of the contacts becomes possible. Therefore, in such a case, conventionally, 24 lead wires are connected by soldering at 48 places at both ends thereof. Such soldering is unnecessary in the present embodiment, so that many electric signal lines are used. It is clear that the effect is great. In this embodiment as well, actually, as described later, the end 32
Another electrical contact pattern is formed on the back surface of the surface on which the electrical contact pattern 38 of A is formed, and another F
Connected to the electrical contact pattern of the PC, three FPCs
It is configured to be connected by overlapping at several places. The end portions 18A and 32A electrically and mechanically connected by the connecting device 40 are arranged at predetermined positions of the camera body 31 to which the pedestal 41 is fixed, as shown in FIG. An opening 26 is provided in the upper plate 11 at a portion facing this position, and a detachable lid member 27 that covers and closes the opening 26 in a normal state is attached to the opening 26. Therefore, by removing the lid member 27, the portion of the connection device 40 where all signal lines are concentrated is exposed at the opening 26, so that the lid member 27 can be removed without removing the upper plate 11 even after the camera assembly is completed. Repair and inspection of the connection device 40 are possible simply by removing the connection device. In FIG. 1, the F of the body unit 30 is
The PC 32 is the FPC 1 of the upper plate unit 20 at the end 32A.
7 is connected to the movable end 18A of the FPC 7 by the connection device 40. In this embodiment, the function of the FPC 32 is further disassembled and divided into several modules, so that the input / output device, the power supply device, The efficiency of this function has been improved. This will now be described with reference to FIG. As shown in FIG. 3, the main body unit 30 is
Central processing module 51 including CPU 34, AF control module 52, aperture control module 53, shutter control module 54, power supply module 55, and DX
It is decomposed into each module of the code reading module 56. The central processing module 51 is the CPU 3
4 and a FPC 32 and the like. The central processing module 51 and each module 5
2, 53, 54, 55, and 56 are connection devices 57 to 6 having the same configuration as the connection device 40 shown in FIG.
1 connected. Outputs of the input / output device, the arithmetic storage device, the information display device, and the like configured in the upper plate unit 20 are sent to the main unit 30 as control input data through the connection device 62 and processed by the modules 51 to 56. The control output data of each module is sent to the upper plate unit 20 through the connection device 63. In this embodiment, the connection devices 62 and 63 are configured by one connection device 40 as described with reference to FIGS.
Of course, two connecting devices may be used. The main unit 30 and the upper plate unit 20 can be connected to external systems 66 and 67, respectively, but the connection device described above can be used for connection to these external systems. Since the camera to which the present invention is applied is constructed as described above, it is needless to say that it is desirable that the above-mentioned modules are independent as electric mounting parts. Therefore, a more specific structure of the main body unit 30 will be described with reference to FIGS. FIGS. 4 and 5 are views of the portion of the camera body 31 having the mirror box portion and the front plate portion as seen from the rear and the front, respectively, and FIG. 6 is shown in FIG.
FIG. 2 is a front view of a portion including a shutter unit and a film feeding unit. In other words, the main unit 30 shown in FIG. 1 includes a first unit 30A (mirror box unit) shown in FIGS. 4 and 5 and a second unit 30A shown in FIG.
It is divided into two units 30B. In FIG. 4, the first unit section 30A has a mirror means for guiding at least the light flux passing through the taking lens to the finder optical system and a mirror having an auxiliary mirror for guiding a part of the photographing light flux to the AF means. Box 70
Is provided with a mirror box unit. On the lower surface of the mirror box 70, an AF sensor base 71, which supports an unillustrated light receiving element for autofocus (hereinafter referred to as an AF sensor), has a hexagonal head and a cross-shaped recess at the center. Adjusting screw 7
2, the tilt of the AF sensor and the position in the optical axis direction are adjusted by the rotation of the adjustment screw 72. From the lower surface of the mirror box 70 including the AF sensor base 71, the mirror box 70
The FPC 74 is attached to one side surface and the back surface of the front plate 73. The FPC 74 constitutes the AF control module 52 (see FIG. 3).
An AF CPU 75, an analog IC 76, a semi-fixed resistor 77 for adjustment, and the like are provided on 74. A large number of check patterns 78 made of copper foil are formed on the front and back sides of the end of the FPC 74 located on the side of the front plate 73. As a result, the check can be performed by the mirror box 70 alone, and even after the first unit portion 30A shown in FIGS. 4 and 5 is assembled to the second unit portion 30B shown in FIG. Pattern 7
It is possible to check by 8. This FPC74
In the upper position of the part attached to the front plate 73,
The electric contact pattern 38 (23) and the hole 3 shown in FIG.
6 (21), 37 (22)
An electrical contact pattern 79 and a hole 8 having the same structure as (24).
A substrate connecting portion 82 composed of 0 and 81 is formed. The bosses 83 and 84 fixed to the front plate 73 are fitted into the holes 80 and 81 to position the board connecting portion 82. The board connecting portion 82 is connected to the board connecting portion 85 of the bent end portion 32B which is formed by bending to the front side adjacent to the end portion 32A of the FPC 32. The board connecting portion 85 also has the same structure including the electric contact pattern 86 and the holes 87 and 88.
The two board connecting portions 82 and 85 are connected to each other by attaching the elastic member 89, the pressing plate 90 and the screw 91 of the connecting device 57 to the bosses 83 and 84 in a state where the electric contact patterns 79 and 86 are overlapped. It Further, as shown in FIG. 5, the aperture control module 53 is provided on the front side of the front plate 73 on the side of the mount 73a.
(See FIG. 3).
A board connecting portion similar to the above is also formed at the upper end portion of the FPC 93, and a similar board connecting portion formed at an end portion 32C extending from a part of the FPC 32 to the front side, and FIG.
Are connected by the connection device 58 in the connection method shown in FIG. A lead wire 95 is connected to the lower end of the FPC 93 by soldering, and the lead wire 95 is connected to a diaphragm mechanism (not shown). Below the FPC 32, there is another FPC 33, and one end of the FPC 33 extends along one side surface of the mirror box 70 and is arranged on the same side surface, as shown in FIG. It is connected to the lead terminal of the light receiving element 96 for direct photometry. Substrate connecting portions 97 and 98 similar to those shown in FIG. 2 are also formed at a bent end portion 33A bent at the other end of the FPC 33 to the front side. The board connecting portion 97 is connected to the shutter control module 54 (FIG. 3).
FP included in the second unit 30B.
The CPC (see FIG. 6) is a portion that is connected to the board connection part 100 formed at the extension end of the FPC 101. The board connection part 98 constitutes the power supply module 55 (see FIG. 3).
(See FIG. 6) The board connecting portion 102 formed at the extended end portion
This is the part that connects. The board connecting portions 100 and 102 are mounted side by side on the front surface of the winding portion 103 of the second unit portion 30B, and are connected to the board connecting portions 97 and 98 and the connecting devices 59 and 60 (FIG. 2) by the method shown in FIG. 3). The FPC 99 includes a shutter control unit 10 on the front side of the shutter unit 104.
5 is connected to the shutter control board 106 attached by soldering. The FPC 101 is connected to a power supply at a portion not shown in FIG. Further, the second unit portion 30B shown in FIG.
, A film feeding section 108 having a patrone chamber for accommodating a film patrone 107 (see FIG. 7).
The FPC 109 constituting the DX code reading module 56 (see FIG. 3) is provided, and the substrate connecting portion 11 is provided at a portion disposed on the upper surface of the film feeding portion 108.
0 is formed. The board connecting section 110 is connected to the board connecting section 111 (see FIG. 4) formed at the end 32A of the FPC 32 of the first unit section 30A by the method shown in FIG. That is, the board connecting portion 39 for connection with the upper plate unit 20 described with reference to FIGS. 1 and 2 is formed on the upper surface of the end portion 32A of the FPC 32. Further, a substrate connecting portion 111 for reading the DX code is formed. Therefore, the electric contact pattern 2 of the board connection portions 24 and 39
The electrical contact pattern 113 of the board connecting portion 111 and the electrical contact pattern 112 of the board connecting portion 110 are connected at the lower surface position of the surface where the wires 3 and 38 are connected. The connection device 40 (see FIGS. 1 and 2) is used to connect these board connecting portions. The pedestal 41 of the connection device 40 is fixed to the upper surface of the film feeding unit 108 of the camera body 31. The film feeding section 10 of the FPC 109.
8, a plurality of gold-plated copper foil contact parts 115 are formed on the front side of the plate 8, and these copper foil contact parts 115 are provided at one end of each leaf spring member 116 as shown in FIG. Are crimped and connected to each other. Each leaf spring member 1
The other end 16 is formed with a spherical drawing at the other end to form a projection 116a. The protruding portion 116a is connected to the leaf spring member 11.
By the urging force of No. 6, the electrical contact state is obtained by pressing against the DX-code conductive foil portion 107a provided on the surface of the film cartridge 107. The DX code signal read by the copper foil contact portion 115 through the leaf spring member 116 is the FPC1
09 and sent to the electrical contact pattern 112 of the board connection unit 110. With this configuration, when the main body unit 30 of the camera is assembled, that is, the first unit portion 30.
Since the flexible printed circuit board attached to the first unit portion 30A can be deformed when the A and the second unit portion 30B are joined together, the assembling work is very easy. Then, as described above, the main body unit 30
If the side is disassembled into each electrical module, it is possible to check when an abnormality occurs in the transmission / reception of a signal between the upper plate unit 20 and the main body unit 30, and to check the upper plate unit 20 during the assembly process of each module. It is possible to easily perform a check or the like using the sending and receiving of the signal. Further, it is possible to realize an electrical mounting unit having many advantages, such as a function guarantee, repair and replacement in each module, and a great reduction in lead wire connection. As described above, according to the present invention, the flexible printed boards arranged in the camera are dispersedly arranged, and the flexible printed boards are provided in the mirror box unit to facilitate the assembling and to assemble the same. It is possible to provide a single-lens reflex camera in which the manufacturing cost is suppressed by the reduction of man-hours, the re-work is easy, and the repairability is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an assembled front view of a camera showing an embodiment of the present invention. FIG. 2 is an enlarged perspective view of a connection portion between two FPCs in FIG. 1; FIG. 3 is a block diagram showing a state where the main unit in the embodiment shown in FIG. 1 is disassembled into a plurality of electrical modules. FIG. 4 is a perspective view of a first unit of the main body unit shown in FIG. 1 divided into two parts, as viewed from the back side. FIG. 5 is a perspective view of a first unit of the main body unit shown in FIG. 1 divided into two parts, as viewed from the front side. FIG. 6 is a perspective view of a second unit part of the main unit shown in FIG. 1 divided into two parts, as viewed from the front side. FIG. 7 is a horizontal plan view of the film feeding unit in FIG. 6; [Description of Signs] 11 Upper plate 12 Liquid crystal display panel (information display device) 16 Strobe contact (input / output device) 17 FPC (flexible printed circuit board on upper plate side) 19 Touch switch ( Input / output device) 20 Upper plate unit 23 Electric contact pattern (electric contact) 24, 39, 82, 85, 97, 98, 100, 10
2, 110, 111 ... board connection part 26 ... opening part 27 ... lid member 30 ... body unit 30A ... first unit part (mirror box unit) 30B ... second unit part 31 ... camera body 32 , 33, 93, 99, 101, 109 ... FPC
(Body side flexible printed circuit board) 34 ... CPU (control circuit) 40, 57 to 63 ... Connection device (connection member) 74 ... FPC (mirror box side flexible printed circuit board)

Claims (1)

(57) [Claims] A mirror box unit that has a mirror unit that guides the light flux that has passed through the taking lens to the finder optical system, is provided detachably with respect to the camera body unit, and a first flexible unit connected to the mirror box unit. A printed circuit board; and a second flexible printed circuit board that is connected to a unit other than the mirror box unit and that is connected to the first flexible printed circuit board. The second flexible printed circuit board comes into contact when the mirror box unit is assembled to the camera body unit.
A single-lens reflex camera characterized by having a continuous contact point .