JPS6188242A - Lens shutter camera - Google Patents

Abstract

PURPOSE:To simplify an assembly process by using a resin molded piece for a shutter base plate which supports a shutter blade, and forming the support part of a film speed reading means which reads information on a film containe at the prolongation part of the base part in one body. CONSTITUTION:The shutter base plate 1 which supports the shutter blade 4 are formed of the resin molded piece. Part of the flat plate part of this base plate 1 is extended and connected to the light shield wall 6a of a film chamber which accommodates a cartridge P. The support part of the film container (DX cartridge) P is formed at the prolongation part in one body. Thus, the shutter base plate and DC electric contact support plate are formed in one body to decrease the number of parts and simplify the assembly process.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lens shutter camera,
In particular, the present invention relates to a lens shutter camera suitable for using a film container having an electrode pattern on its surface.

[Conventional technology]

In order to transmit information such as the ISO sensitivity of the loaded film to the loaded camera and automatically set it to the camera's film sensitivity mechanism, a so-called film sensitivity automatic setting cartridge (with a trap electrode pattern on the outside of the film container, i.e. the cartridge) is used. (hereinafter referred to as DXX Patrone) has been proposed.

Figure 4 shows the external appearance of the X Patrone.The electrode patterns include a common pattern 11 as the ISO sensitivity display electrode and a code pattern 12°, and a group of electrical contacts provided on the camera body side. An electric circuit connected to this allows ISO sensitivity information to be read automatically.

In this camera using a 5-inch X cartridge, holes are provided in the light-shielding wall of the film frame that accommodates the cartridge, through which the electrical contact groups protrude, and each hole is penetrated by a spring-biased electrical contact group. I am wearing it. These electrical contacts and spring members are supported by a support member fixed to the back surface of the light-shielding wall, and are electrically connected to an electric circuit that controls the shutter blades and the aperture blades through lead wires.

On the other hand, in a lens-shutter camera, an exposure adjustment member such as a shutter blade is placed between the film chamber that houses the cartridge and the film chamber that has the film winding shaft, and on the outside of the light-shielding walls of both film chambers. The installed shutter base plate is fixed.

[Problem that the invention seeks to solve]

As mentioned above, the support member that supports the electrical contact group that takes out information from the DX cartridge and the shutter base plate that has the member that adjusts the exposure amount based on the information are both used to block light from both film chambers. Although they are placed on the wall, they are separate structures, and each is fixed to the camera body.

Such a conventional separate structure type has the following problems.

(1) Since the electric contact group holding member and the shutter base plate are each attached to the camera body, it takes time to assemble them with screws.

(2) Both components are manufactured separately, which increases component costs and complicates process control.

(3) Wiring work is required to connect and conduct the lead wires from the electrical contact group to the electrical circuit on the shutter base plate.

(4) When attaching and detaching both members from the camera body, there is a risk that the lead wire stretched between the two members may be disconnected or the connection may be poor.

(5) '! There is a risk of light rays leaking from the hole in the film chamber of the camera body that passes through the air contact group.

[Means for solving problems]

An object of the present invention is to provide a lens shutter camera that can reduce the number of parts, reduce parts costs, and simplify the assembly process. This is achieved by a lens-shutter camera characterized in that the extended portion of the base plate is integrally formed with a supporting portion of a film sensitivity reading means for extracting information from a film container.

〔Example〕

Embodiments of the present invention will be specifically described below based on the drawings.

FIG. 1 is a perspective view of a shutter base plate according to the present invention,
FIG. 2 is a partial sectional view of the lens shutter camera in which the shutter base plate is assembled into the camera body and the DX Hatrone is loaded.

In these figures, the shutter base plate 1 has an aperture 1a in the center, through which the light beam from the photographing lens 2 passes. A stepped open plane 16 is provided on the surface side of the shutter base plate 10, that is, on the side of the incident light beam from the photographing lens 2, and together with the blade presser plate 3 fixed on the outside thereof, a slit space is formed to maintain a predetermined gap. There is. The central portion of the vane presser plate 3 has an aperture 3a having the maximum aperture diameter for the photographing light beam by the photographing lens 2. At least one shutter blade 4 is built in the slit space and is rotatably supported and held. The shutter blade 4 rotates based on an exposure control signal from a light-receiving element (not shown) and an ISO sensitivity 1n report, opens and closes at a predetermined time or a predetermined aperture diameter, and controls the light passing through the photographic lens 2 to a predetermined value. The photosensitive film F is exposed to the same amount of light.

Aperture blades 5 are rotatably supported on the surface of the blade holding plate 3 opposite to the shutter blade surface, and are opened and closed to a predetermined aperture diameter in response to the exposure control signal. The wiring and electrical components of the electric circuit that processes the exposure control signal are mounted on the shutter base plate 1 or the blade holding plate 3, and are operated by being supplied with power from the power source within the camera body 6.

In addition, a part of the back side of the flat plate part of the shutter base plate 1 is a mounting surface for the camera body 6, and the shutter base plate 1
is fixed to the mounting surface of the camera body 6 with screws or the like.

Furthermore, a part of the flat plate part of the shutter base plate 1 is extended,
It is connected to the light-shielding wall 6a of the film chamber that accommodates the cartridge P. This extended portion 1c is coupled to the light-shielding wall 6a in a light-tight state and forms a part of the light-shielding wall.

A plurality of holes are drilled inside this extension portion IC, and a seat pin-shaped electric contact piece 7 is fitted into each hole. A spring 8 in the form of a coil spring comes into contact with the seat of the electric contact piece 7, and by closing and fixing the lid member 9 to the extended portion 1c of the shutter base plate 1, the electric contact piece 7 is brought into a compressed state. The electric contact piece 7 is made of a conductive material, and the seat portion is connected to the electric contact point of the lid member 9 via a lead wire or the like.

The lid member 9 is a printed circuit board printed on an insulating substrate, has electrical components mounted on its surface, and is further connected to an exposure control circuit on the shutter base plate 1.

The tip, which is the other end of the electric contact 7, protrudes into the film chamber of the camera body 6, and when the DX cartridge P is loaded,
Press against the outer wall of DX Patrone P. FIG. 3 is a partial perspective view showing a state in which a film container is attached to and removed from a film chamber of a lens shutter camera. When the DX cartridge P shown in the figure is loaded into the film chamber 10 in FIG. The electrodes 11, 12 abut against the electrical contact piece 7 and serve to push it in.

As a result, the film sensitivity mounted on the lid member 9 is electrically connected to the plurality of electrical contacts 7 kept in contact with the respective electrodes of the common pattern 11 and the code pattern 12 provided on the DX cartridge P. The signal from the DX cartridge P that is input to the information discrimination circuit is discriminated as film sensitivity by the discrimination/control circuit, and the information discriminator base plate 1 or An instruction is given to the exposure control device on the blade holding plate 3.

Note that instead of the bottle-shaped electric contact piece 7 and the coil spring-like spring 8, a protruding electric contact piece directly fixed to the tip of the leaf spring may be configured to protrude into the film chamber IO. can.

〔Effect of the invention〕

According to the present invention, the shutter base plate and DX! By integrally forming the support plate for the air contact point, we were able to reduce the number of parts and create a lens shutter camera with excellent assembly ease. In addition, an exposure control device disposed on the shutter base plate or a blade holding plate integrally fixed thereto;
By arranging the circuit that discriminates and controls information signals from the X Patrone on an integrated base plate, wiring is made easier and accidents such as disconnections can be prevented. Furthermore, we have realized a lens-shutter camera that has a film sensitivity setting mechanism that has an excellent structure to prevent light from leaking into the film chamber where the electrical contacts are arranged.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the shutter base plate according to the present invention, FIG. 2 is a partial cross-sectional view of a lens shunter camera in which the shutter base plate is assembled into the camera body and a film container (patrone) is loaded, and FIG. A perspective view showing a state in which a film container is attached to and removed from a film chamber of a shutter camera, and FIG. 4 is an external perspective view of the DX Hatrone. 1... Nyanotar base plate IC... extension part (electrical contact support part) 2... photographing lens 3... vane presser plate 6... camera body
7... Electric contact piece 8... Spring

Claims (1)

[Claims] A lens shutter camera characterized in that a shutter base plate supporting a shutter blade is formed of a resin molded product, and a supporting part of a film sensitivity reading means for extracting information from a film container is integrally formed in an extension of the base plate.