JPS6025052Y2 - SLR camera wiring structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wiring structure for a single-lens reflex camera in which the finder is replaceable and the exposure amount is electrically controlled.

In a single-lens reflex camera that uses conventional electronic circuits to electrically control the exposure amount, the wiring methods between printed boards with each function or between each switch are: ■ Lead wire, ■ Passing through the top of the penda prism. There were two methods of using flexible printed circuits and lead wires.

Method (2) will be extremely troublesome when electronic circuits are widely introduced in the future, and method (2) will inevitably be devised.

However, in the case of a camera with an interchangeable finder, it is completely impossible to pass through the top of the pentaprism, which conventionally had ample space, making the application of (2) extremely difficult.

Therefore, the purpose of the present invention is to add
To provide a wiring structure which can effectively utilize the space of a camera body while using a flexible printed circuit, and which facilitates the connection of electric circuits.

Examples of the present invention will be described in detail below.

FIG. 1 is a perspective view showing the wiring structure according to the present invention,
Shows the mirror box removed from the camera body.

FIG. 2 shows the structure of the flexible printed circuit used in the present invention.

In Figure 1, 1 is the camera body, 2 is the front curtain drum,
3 is a rear curtain drum, 4 is a shutter rear curtain, 6a and 6b are light receiving elements, 7 is an integrated circuit with a built-in exposure control circuit, Mg
8 is a magnet for controlling the shutter rear curtain, 8 is a switch element whose contacts change according to the selected shutter speed in conjunction with a shutter dial (not shown), and 9 is a switch element in conjunction with a film sensitivity setting dial (not shown). A resistive element whose resistance changes depending on the selected film sensitivity, M is mirror 1
It is a mirror box containing 5.

The flexible printed circuit 10 has a first part 10a extending along the longitudinal direction of the camera body at the upper part of the film winding chamber side of the camera body 1, and a first part 10a extending along the longitudinal direction of the camera body along one edge of the mirror box. a second portion 10b extending to the bottom of the mirror box, a third portion 10C extending to the bottom of the mirror box, a fourth portion 10d extending in the vertical direction of the camera body along the other edge of the mirror box, and a third portion 10C extending to the bottom of the mirror box; The fifth portion 10e extends along the longitudinal direction of the camera body at the upper portion on the patrone chamber side.

The first part 10a receives shutter speed information from the switch element 8 via the terminal 11, and the fifth part 10e receives film sensitivity information from the resistor element 9 through the terminal 12.
Receive through.

Further, the third portion 10c is provided with light receiving elements 6a and 6b, an integrated circuit 7, and a magnet Mg.

In the flexible printed circuit 10, these shutter speed information terminal 11, film sensitivity information terminal 12, light receiving elements 6a and 6b, and magnet M are connected according to a known method.
g. A wiring pattern is formed to connect the integrated circuits 7.

Note that the first thing. From the second portions 10a and 10b, various information such as battery check start, self-timer activation, object brightness storage, etc. can be introduced.

In this case, the integrated circuit must include a batch reach circuit, a self-timer circuit, and a subject brightness storage circuit that operate based on this information.

FIG. 2 shows an embodiment in which when a large amount of information is input to the integrated circuit 7 and a single flexible printed circuit is insufficient for transmitting the information, the insufficiency is compensated for by stacking the flexible printed circuits.

The first part 10a1, the second part 10b, and the corresponding sixth part 10f1, and the seventh part 10g are laminated, and the third part 10c overlaps these sixth part and seventh part 10f.
, 10g are connected.

The same thing applies to the fourth. This is also possible for the fifth portions 10d and 10e.

As described above, according to the present invention, the flexible printed circuit is configured as described above, and is passed from one side of the camera (film winding chamber side) to the other side of the camera (patron drive chamber side) through the lower part of the mirror box. On the third portion 10c, not only a light receiving element but also an integrated circuit containing an electric shutter circuit and a magnet controlled by the electric shutter circuit are placed. First exposure information such as shutter speed information can be introduced from the section 10a, and second exposure information such as film sensitivity information can be introduced from the fifth section 10e, making it possible to replace the viewfinder. Not only does this eliminate the need for additional electrical contacts, but the space on the camera body can be used more effectively.

In addition, the wiring structure according to the present invention, as in the above-mentioned embodiment, reflects the object light from the secondary mirror on the rear side of the mirror, the fitting surface after the mirror is raised, or the shutter curtain, and makes it enter the light receiving element at the bottom of the mirror box. It is used for cameras that use an automatic control system, as well as for cameras that use a manual control system that electrically controls the shutter speed based on the shutter speed selected with the shutter speed dial.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the wiring structure according to the present invention with a mirror box removed from a camera body, and FIG. 2 is a perspective view showing an embodiment of the flexible printed circuit structure according to the present invention. Explanation of symbols of main parts, camera body...1,
1st part...10a, mirror box...
...M1 second part...10b1 third part...
...10c1 4th part...10a1 5th part...10e1 Flexible printed circuit...
...10, Integrated circuit...7, Shutter speed control introduction element...11, Film sensitivity control introduction element...12, Sixth part... 10f
1 7th part...10g0

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a single-lens reflex camera that has a replaceable viewfinder and controls the exposure amount electrically according to exposure factors: a first part extending along the direction, a second part extending longitudinally of the camera body along one edge of the mirror box, and a third part extending along the bottom of the mirror box.
a fourth part extending in the longitudinal direction of the camera body along the other end of the mirror box, and a fifth part extending in the longitudinal direction of the camera body at the upper part of the camera body on the patrone chamber side. A wiring structure comprising: a flexible printed circuit; a first exposure factor introduction element connected to the first part; and a second exposure factor introduction element connected to the fifth part. . 2. The utility model according to claim 1, wherein the first exposure factor introducing element is an element introducing information on shutter speed, and the second exposure factor introducing element is an element introducing information on film sensitivity. Wiring structure. 3. The wiring structure according to claim 1, wherein the third portion is provided with an integrated circuit having a built-in exposure control circuit.