JPH02198437A - Camera - Google Patents

Abstract

PURPOSE:To readily assemble the device by separately forming a front base which holds a photographing lens and a main body which has an window which meshes a picture frame and a sprocket with the perforation of a film and holds the front base and mounting the sprocket on a front base side. CONSTITUTION:On the picture frame 21 of the main body 1, an window part 74 from which a film moving and detecting sprocket 73 is faced is formed near the mounting recessed part 70 of a film pressing roller 69 at a position which faces the perforation of a photographing film. The sprocket 73 is fitted in a recessed part 34a formed on the front base 34, fixed by a sprocket presser foot 75 and unified. Therefore, when the front base 34 on which a lens barrel unit is mounted is assembled on the main body 1, the film moving and detecting sprocket 73 can be meshed with the perforation of the photographing film through the window part 74 of the picture frame 21. Thus the camera is readily assembled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a camera having a sprocket that engages perforations in photographic film.

[Prior Art] Some cameras, for example, rotate a sprocket every time a photograph is taken to wind the photographic film, or rotate a sprocket as the film is wound to control the feeding of the film.

The teeth of this sprocket are generally rotatably attached to the frame of the camera body so as to mesh with the perforations of the film through a window formed in the frame of the camera body.

[Problems to be Solved by the Invention] In order to rotatably attach the sprocket to the picture frame section of the main body, the sprocket is pivoted through a window in the picture frame section so as to mesh with the perforations of the film. Since this is narrower than the vertical dimensions, a shaft is supported between, for example, the picture frame and a winding/rewinding unit disposed above the picture frame, and a sprocket is attached to this shaft. By the way, if the shaft is attached between the two members of the main body, the picture frame and the winding/rewinding unit, there are complicated mechanical parts around it, and the shaft is short, so it takes time to assemble. Furthermore, the sprocket must be assembled from the opposite side of the picture frame from the film rail, and this restriction on the direction of assembly impairs work efficiency.

The present invention has been made in view of the above, and an object of the present invention is to provide a camera in which the sprocket is compactly integrated with the front base plate and can be easily assembled to the main body.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention has a front base plate for holding a photographic lens, a window for engaging an image frame and a sprocket with perforations of a photographic film, and a front base plate for holding the front base plate. The main body is formed separately, and the sprocket is attached to the front base plate side.

[Function] In the camera of this invention, a sprocket is attached to the front base plate that holds the lens barrel unit to form a unit, and when this front base plate is assembled to the main body, the sprocket meshes with the perforations of the photographic film through the window of the picture frame. be able to. In this way, the sprocket is not attached to the picture frame section, where it is difficult to secure an arrangement space, but is attached in advance to the front base plate side to form a unit, making assembly of the camera easier. In addition, this front base plate makes it easy to secure a space for sprocket assembly and has good workability, and furthermore, by assembling the sprocket to the front base plate and making it into a unit, it becomes compact. In addition, when a control circuit is provided on the front base plate, the mechanism for obtaining information on the rotation speed of the sprocket or the mechanism for controlling the rotation of the sprocket can be integrated, simplifying the structure and avoiding the influence of noise. be able to.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

Figure 1 is a front view of a camera to which the present invention is applied, Figure 2 is a front view with the front cover removed, and Figure 3 is the I of Figure 1.
The II-III sectional view and FIG. 4 are exploded perspective views of the camera body, front base plate, photographic lens, etc.

This camera consists of a main body 1, a front cover 2, a decorative panel 3, and a back cover 4, each of which is made of synthetic resin. A decorative panel 3 is engaged with the front side of the front cover 2, and the front cover 2 is engaged so as to cover the main body 1 and fixed with screws.

The decorative panel 3 has a window 6 of the flash tube 5 of the strobe, a window 8 of the objective lens of the finder 7, a window 10 of the light emitting AF lens 9, and a window 12 of the light receiving AF lens 11, which are transferred to the decorative panel 3. and a window portion 14 of the AE light receiving element 13 are formed.

Furthermore, the decorative panel 3 has a protrusion 15 near the bottom of the strobe window 6 to prevent fingers from getting caught on the window 6, and a protrusion 15 near the bottom of the lens barrel 17 to prevent fingers from getting caught on the lens barrel 17. A protrusion 16 is integrally formed.

The back cover 4 and battery cover 18 are attached to the main body mounting body 19 with a hinge shaft 2.
0, and this main body mounting body 1
9 is engaged with the main body 1 and further fixed with screws. The back cover 4 and the battery cover 18 are assembled in advance to the main body mounting body 19 via the hinge shaft 20 to form a unit and then assembled to the main body 1.

A cartridge chamber 22 and a take-up chamber 23 are formed in the main body 1 with an image frame 21 in between. It is wound up by the roller 25. This film is wound using an automatic winding method using a built-in motor 26, which drives a winding unit 27 to wind the photographic film F onto the reel 25, and then closes the back cover 4 and starts autoloading by operating the release button. It is a method. When the photographing of the last frame is completed, the built-in motor 26 drives the rewinding gear system 28 to rewind the photographic film F, and when the rewinding is completed, it automatically stops.

A main body mounting body 19 attached to the main body 1 partitions a winding chamber 23 and a battery chamber 29. A lithium battery 30 is housed in this battery chamber 29, and can be replaced by the user by opening and closing the battery cover 18. It is now possible. Furthermore, a button battery 31 is housed in the back cover 4, which functions as an auto-dating device and as a backup power source for the main power source.

A pressure bonding plate 32 is provided inside this back M4, and a tunnel gap is formed between this pressure bonding plate 32 and a film rail 33 formed near the image frame 21 of the main body 1, and the photographic film F is run. I try to let them do it.

A front base plate 34 of the lens barrel unit is provided between the winding chamber 23 and the cartridge chamber 22 of the main body 1, facing the image frame 21, and the lens barrel frame 35 is connected to the drive shaft 36 on this front base plate 34. It is provided so as to be movable along the guide shaft 37 in the optical axis direction. This lens barrel frame 35 is integrally combined with the lens barrel 17 equipped with a photographing lens 38, and is driven by a motor 39.
The drive shaft 36 is rotated via a gear mechanism 40 to move the photographic lens 38 in the direction of the optical axis, and when it is moved backward, it is collapsed. The photographic lens 38 is composed of four lenses in four groups, and is attached to the lens barrel frame 35 via supports 41 and 42.
The photographing lens 38 has a shutter 4 between the lenses.
3 is used, and the three lenses 38a, 38b, and 38c are made of glass, and the one lens 38d on the photographic film side is made of aspherical plastic.

The front surface of the photographic lens 38 is covered with a lens barrier 44, and this lens barrier 44 consists of two divided barriers 44a,
44b, which opens and closes in one direction in conjunction with the movement of the photographic lens 38.

A rewinding gear system 28 is arranged above the picture frame 21 of the main body 1, and roughly above the picture frame 21 there are two mounting parts for the light emitting side and the light receiving side of the AF lens provided on the front base plate 34. 45
．． 46 and the mounting portion 47 of the finder 7, which is formed by a recess, is located between the numbered portions 45 and 46.

As shown in FIG. 2, in the upper part of the winding chamber 23, a step X1 from the front base plate 34 is formed in the direction of the winding axis, and a circuit board 48 is disposed within this step X1. is provided with a circuit element 49 on the primary side of the strobe circuit, a switch element 50 for the release button, a switch element 51 for the power button, a switch element 52 for the close-up button, etc., making effective use of the space above the winding chamber 23. are doing. Further, the circuit board 48 includes a strobe capacitor 5.
3 is connected.

Further, a step x2 from the front base plate 34 is formed in the upper part of the cartridge chamber 22 in the direction of the winding axis, and a circuit board 54 and a flash tube 5 are arranged within this step X2.
The reflective umbrella 5a is fixed to the upper part of the patrone chamber 22. A circuit element 55 on the secondary side of the strobe circuit is connected to the circuit board 54, and the secondary side and the primary side of the strobe circuit are connected by a lead wire 56 passing through the upper part of the front base plate 34, and the space above the cartridge N22 is connected. It is used effectively.

Further, a step X3 is formed at the lower part of the winding chamber 23 and the cartridge chamber 22 in the direction of the winding axis, and a step X3 is formed at the lower part of the image frame 21 within this step X3, and the cartridge chamber 22 side is closed. A motor 39 is arranged so that its rotation axis 39a is parallel to the optical axis. Further, on the winding chamber 23 side, bent parts 57a and 57b of a flexible printed wiring board 57 are arranged in two stages, and a circuit element 58 is connected to this flexible printed wiring board 57 to form a main control circuit. It is located. In this way, the winding chamber 2
A motor 39 that drives the lens barrel 17, a lens barrel drive mechanism, and a control unit are arranged by effectively utilizing the space formed by the step X3 between the lens barrel 17 and the cartridge chamber 22, and there is a special space for arranging these. There is no need to ensure

A first connector portion 6o is formed between the outer circumference of the winding chamber 23 and the strobe capacitor 53, and a second connector portion 61 is formed between the outer circumference of the winding chamber 23 and the front base plate 34. The space created around the outer periphery of the intake chamber 23 is effectively utilized. The flexible printed wiring board 57 is the first connector part 6o, and the end 63a of the flexible printed wiring board 63 connected to the back cover side circuit 62 of the back cover 4 and the crimp fitting 64
The back cover circuit 62 constitutes a data imprint circuit and a display circuit.

Further, the second connector portion 61 includes a flexible printed wiring board 57 and a front flexible printed wiring board 6.
6 are fixed with screws 68 via crimp fittings 67, and the front flexible printed wiring board 66 is fixed without soldering like the flexible printed wiring board 63.
is easily and reliably connected.

The flexible printed wiring board 66 is arranged between the side wall 23a of the winding chamber 23 and the front base plate 34 that supports the lens barrel 17 on the picture frame 21 side. In order to securely wind the film around the winding shaft, the side wall 2 forming this winding chamber 23 is
3a is made to protrude toward the picture frame 21 side, and as shown in FIGS. 3 and 4.
As shown in the figure, a film pressing roller 69 is installed in the winding chamber 23.
A mounting space 70 is formed, and a film pressing roller 69 is mounted in this mounting space 70. By forming this mounting space 70, a part of the side wall 23a of the winding chamber 23 protrudes toward the picture frame 21 side as shown in FIG. A space 71 is formed between it and 23a.

A circuit portion 66a for guiding information to the connector 61 side formed on the flexible printed wiring board 66 is connected to the winding chamber 2.
The circuit portion 66b located in the space 71 is connected to a circuit component such as a circuit element 72.

These constitute circuits that output photographing information, such as an AE circuit and an AF circuit, and by arranging the circuits close to the AF light emitting section, the influence of noise can be prevented.

In this way, by utilizing the space 71 formed between the side portion 23b of the winding chamber 23 and the front base plate 34 by the protrusion 23b of the winding chamber 23, the flexible printed wiring board 66 can be arranged. Since the circuit element 72 is connected, there is no need to secure a special arrangement space for the circuit components.

In the image frame 21 of the main body 1, a sprocket 7 for detecting film movement is provided near the mounting recess 70 of the film presser roller 69 and at a position facing the perforations of the photographic film F.
A window portion 74 is formed through which the window 3 is exposed. This film movement detection sprocket 73 fits into a recess 34a formed in the front base plate 34 and is fixed by a sprocket holder 75. A sprocket contact piece 76 is provided so as to be in contact with the shaft portion of the film movement detection sprocket 73.
The number of rotations of the sprocket 73 for detecting film movement is detected, and the amount of movement of the photographic film F and other transport information are obtained from this number of rotations.

In this way, the film movement detection sprocket 73 is attached to the front base plate 34 to form a unit.
When assembled, the film movement detection sprocket 73 can be passed through the window 74 of the picture frame 21 and engaged with the perforations of the photographic film.

Therefore, the film movement detecting sprocket 73 is not attached to the picture frame section 21 for which it is difficult to secure a placement space, but is attached to the front base plate 34 in advance to form a unit, thereby facilitating assembly of the camera.

Further, this front base plate 34 allows easy securing of space for assembling the film movement detection sprocket 73, and has good workability. Furthermore, by assembling the film movement detection sprocket 73 to the front base plate 34 to form a unit, it becomes more compact. Further, the front base plate 34 is equipped with a control circuit, and when the film movement detection sprocket 73 is attached to the front base plate 34, the mechanism for obtaining rotation speed information can be integrated, and the structure is simplified. Moreover, the influence of noise can be avoided.

The flexible printed wiring board 57 covers the outer periphery of the take-up chamber 23, is bent at the lower part thereof, and is arranged to pass under the motor 39 and cover the outside of the cartridge chamber 22 on the opposite side of the lens barrel 17. A circuit element 59 is connected and further soldered to the circuit board 48 on the winding chamber 23 side.

Although this embodiment has been described using a film movement detection sprocket as an example, the sprocket is not limited to this, and may also be a film feeding sprocket.

[Effects of the Invention] As described above, the present invention is characterized in that the front base plate that holds the photographic lens is separate from the main body that holds the front base plate and has a window portion for engaging the picture frame and the sprocket with the perforations of the film. Since the sprocket is attached to the front base plate of the camera, the sprocket can be pre-attached to the front base plate that holds the photographic lens, instead of being attached to the picture frame, where it is difficult to secure placement space. Assembly becomes easier.

In addition, it is easier to secure space for sprocket assembly on the front base plate compared to the image frame of the main body, and it is also easier to work with.
Furthermore, by assembling the sprocket to the front base plate and making it into a unit, it becomes more compact.

Furthermore, when a control circuit is provided on the front base plate, by assembling the sprocket, the machine configuration that obtains rotation speed information or the mechanism that controls the rotation of the sprocket can be integrated, resulting in a simple structure and easy operation confirmation. Moreover, the influence of noise can be avoided.

[Brief explanation of the drawing]

Figure 1 is a front view of a camera to which the present invention is applied, Figure 2 is a front view with the front cover removed, and Figure 3 is the I of Figure 1.
The II-III sectional view and FIG. 4 are exploded perspective views of the camera body, front base plate, photographic lens, etc. In the figure, 1 is the main body, 21 is the picture frame, 22 is the cartridge room,
23 is a winding chamber, 34 is a front base plate, 38 is a photographic lens, 73 is a sprocket for detecting the motion of the film 8, and 74 is a window portion.

Claims (1)

[Claims] A front main plate that holds a photographic lens and a main body that holds the front main plate and have a window portion for engaging an image frame and a sprocket with the perforations of the photographic film are formed separately, and the sprocket is attached to the front main plate side. A camera characterized in that it is attached to.