JPH063574A - Lens shutter camera - Google Patents

Abstract

PURPOSE:To provide a camera equipped with an FPC housing part which is not obstructed from making the camera compact. CONSTITUTION:This camera is provided with a 1st lens group 1 opposed to a light shielding blade 6a and arranged on an object side interposing the blade 6a, a 1st holding member 3 holding the 1st lens group 1, a 2nd lens group 2 arranged on a film surface side interposing the blade 6a, a 2nd holding member 4 holding the 2nd lens group 2, a lens barrel 5 arranged on the outside of the 1st and the 2nd holding members 3 and 4 so as to cause the 1st and the 2nd lens groups 1 and 2 to move forward and backward in an optical axis direction, a driving means 6 driving the blade 6a, and a flexible printed circuit board FPC 11 by which the driving means 6 and an electric circuit 19 in a camera main body are connected to communicate and in which deflection is caused in accordance with the movement of the lens barrel 5 in the optical axis direction; and a cavity capable of housing the FPC 11 in a bend state is formed between the lens barrel 5 and the member 4, and the bent FPC 11 is housed there.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement of a shutter of a lens shutter camera and a flexible printed circuit board.

[0002]

2. Description of the Related Art In a lens shutter camera of a type in which a taking lens barrel advances and retreats in the direction of the optical axis, a flexible printed circuit board (hereinafter referred to as FPC) is used to provide a shutter (a shutter here is a shutter blade, a drive source, a blade drive mechanism). Etc. are said to be unitized) and the camera body is electrically connected. .

Since the FPC is bent due to the advancing / retreating of the taking lens barrel, the bending of the FPC is conventionally stored in a storage portion in the camera body or a space between the inner circumference of the lens barrel and the outer circumference of the shutter. I was storing it. Figure 4
FIG. 6 is a perspective view showing a conventional example in which an FPC storage portion is provided in a camera body, and an FPC (111) is stored in a large space (101) provided above the camera body.

FIG. 5 is a perspective view showing a conventional example in which an FPC (211) accommodating portion is provided between the inner peripheral portion of the lens barrel (205) and the shutter unit (206). In addition, on the outer circumference of the lens barrel (205), the inner helicoid (2
15) is provided.

[0005]

Problems to be Solved by the Invention However, FIG.
As shown in the camera body, a new FPC (111) compartment (1
When 01) is provided, the outer shape of the camera body must be necessarily increased in order to arrange the components other than the FPC (for example, the AF device and the AE device) in the camera body. There was a problem that it was an obstacle.

Further, as shown in FIG. 5, if an FPC (211) accommodating portion is provided between the inner circumference of the lens barrel and the outer circumference of the shutter, the lens barrel
The outer diameter (a) of (205) (more specifically, the diameter of the inner helicoid (215) provided in the lens barrel) increases by the width of the storage part, and in this case also the outer shape of the camera body increases and the camera There is a problem that it hinders compactness. Also F
If the curvature of the bending portion (bending portion) of the PC is made too small, the stress applied to the FPC when the lens barrel advances and retracts becomes large.
It will damage the PC. Therefore, the FPC storage portion cannot be made extremely small, and the FPC storage portion must have a certain size.

An object of the present invention is to provide a compact camera having a sufficient storage space that does not damage the FPC.

[0008]

In order to solve the above-mentioned problems, in the present invention, a first lens group (1) which is arranged on the object side facing the light-shielding blade and sandwiching the light-shielding blade, A first holding member (3) for holding the first lens group, and a second lens group (2) arranged on the film surface side sandwiching the light shielding blade.
A second holding member (4) for holding the second lens group,
The first and second holding members are disposed outside the first holding member,
And a lens barrel for moving the second lens group back and forth in the optical axis direction.
(5), a driving means (6) for driving the light-shielding blade, and the driving means and an electric circuit (19) provided in the camera body are electrically connected to each other, and a signal of the electric circuit is supplied to the driving means. And a flexible printed circuit board (11) that generates a flexure according to the forward and backward movement of the lens barrel in the optical axis direction, the lens shutter camera having a flexible printed circuit board (11) between the lens barrel and the second holding member. A space is provided in which the flexible printed circuit board can be stored in a flexed state, and the flexed flexible printed circuit board is stored in the space.

[0009]

In the present invention, since the flexible printed circuit board (FPC) which has been bent is stored in the space (dead space) between the lens barrel and the second holding member, it is necessary to newly provide an FPC storage section. Without making the camera compact. In addition, since the gap between the lens barrel and the second holding member is relatively wide, the FP moves when the lens barrel advances and retracts.
It is less likely that C will be damaged by large stress.

[0010]

1 and 2 are sectional views of a lens shutter camera showing an embodiment of the present invention. In Figure 1, the lens barrel (5)
Is extended from the inside of the camera to the outside of the camera, and shooting can be performed in this state. In FIG. 2, the lens barrel (5) is retracted inside the camera, so that it is not possible to take a picture in this state.

One screw portion (5a) provided on the lens barrel (5)
Is a front lens group holding member (3) for holding the front lens group (1)
The front lens group holding member (3) is fixedly coupled to the lens barrel (5) by the engagement with the screw portion (3a) provided on the. The other screw part (5b) provided on the lens barrel (5) engages with the screw part (4a) provided on the rear group lens holding member (4) for holding the rear group lens (2), and this engagement According to the combination, the rear lens group holding member (4) is fixedly connected to the lens barrel (5). The shape of the rear lens group holding member (4) is such that the opening on the film surface side is larger than the opening on the subject side (the side facing the shutter blades).

A front ornament (12) is provided in front of the front lens holding member (3) (on the side of the subject) so as not to impair the appearance.
The threaded portion (12a) of (12) and the threaded portion (5a) of the lens barrel (5) are fixed by engagement. A rear decoration (13), which functions as a key groove of a straight-forward key (16) described later, is fixed to the rear (film side) of the rear lens group holding member (4).

The front lens group holding member (3) has a screw (7).
The shutter device (6) is installed by. This shutter device (6) consists of a shutter blade (6a) and a front unit located closer to the subject than the shutter blade.
(6b) and a rear unit (6c) which is arranged on the film surface side of the shutter blade and which is arranged so as to sandwich the shutter blade together with the front unit.
As you can see from the figure, part of the front unit (6b) (6b ₂ )
Are arranged on the film surface side with the shutter blade interposed therebetween.

The front unit (6b) has shutter blades (6a)
A shutter blade drive mechanism (not shown in detail because it is publicly known) for driving the shutter blade drive mechanism is provided in the rear unit (6c) described later, which is a drive source for driving the shutter blade drive mechanism. A rotor (6d) is provided. The shutter device (6) and the camera body (20) are connected at one end (11a) to the circuit board (10) fixed to the shutter device (6) and at the other end (11c) at the camera body (2).
It is electrically connected by the flexible printed circuit board (11) (hereinafter referred to as FPC) connected to the circuit board (19) of (0).

The FPC (11) is provided at its intermediate portion with a bending portion (11b) capable of accommodating movement of the lens barrel (5). Figure 1
From the shooting state shown in Fig. 2 to the retracted state shown in Fig. 2, the lens barrel (5)
When the lens barrel is displaced, the curved portion of the FPC (11) increases in accordance with the displacement of the lens barrel as shown in the figure, and the curved portion increases as much as the lens barrel (5) is retracted as compared to the case of the photographing state. It is configured.

The camera body (20) is fitted with a helicoid ring (14) which is rotatable only because its movement in the optical axis direction is restricted by the pressing plate (15). This helicoid ring (1
A female helicoid screw (14a) is provided on the inner peripheral part of 4), and this female helicoid screw (14a) is screwed with a male helicoid screw (5c) provided on the outer peripheral part of the lens barrel (5). ing. A gear (14b) is provided on the outer periphery of the helicoid ring (14) and meshes with the gear (18) of the motor (17).

A straight-moving key (16) is fixedly mounted on the camera body (20) and is engaged with a key groove (5d) provided on the lens barrel (5). Therefore, the lens barrel (5) cannot rotate and can only move back and forth in the optical axis direction. Therefore, when the motor (17) rotates, the helicoid ring (14) rotates via the gear (18), and this rotational force causes the female helicoid screw (14a) of the helicoid ring (14).
And the male helicoid screw (5c) on the lens barrel (5)
It is transmitted to (5). However, since the lens barrel (5) cannot rotate, the rotational force of the motor becomes a forward / backward force in the optical axis direction, and the lens barrel (5) moves forward / backward in the optical axis direction as the motor rotates.

The bending amount of the bending portion (11b) of the FPC (11) varies depending on the amount of displacement of the lens barrel (5) in the optical axis direction. In addition, the back cover (22) is provided with a pressure plate (21) that defines the film position, and the cover (23) is configured to cover the camera body. FIG. 3 is a sectional view taken along the line I--I of FIG. 1, showing the structure inside the lens barrel on the film surface side of the shutter blade (6a).

Outer peripheral portion of rear lens group holding member (4) and lens barrel
A rotor (6d) is arranged in the lower center of the lens barrel in the space between the inner periphery of (5). This rotor (6
A pair of stators (6e) and a pair of coils (6f) sandwiching d)
Are arranged in an arc shape. Shutter device described above
(6) The rear unit (6c) is composed of this rotor (6d), a pair of stators (6e), and a pair of coils (6f). In the remaining space where the rotor (6d), stator (6e), and coil (6f) are not arranged (near the upper center of the space between the outer periphery of the rear lens group holding member and the inner periphery of the lens barrel), the FP
The circuit board (10) connected to C (11) is a pair of stators.
It is placed so as to be sandwiched between (6e). The flexure (curved portion) of the FPC that occurs when the lens barrel advances and retracts is also stored in this space. Since this storage space can be made relatively wide as is clear from FIGS. 1 and 2, the curvature of the curved portion does not become extremely large.

[0020]

[Effect] As described above, in the present invention, the flexible printed circuit board (FPC) which is bent is used as the lens barrel and the second lens barrel.
Since the camera is configured to be housed in the space (dead space) between the camera and the holding member, the camera can be made compact without the need to newly provide an FPC housing. Further, since this void (dead space) is considerably large, the curvature of the curved portion of the FPC can be increased, and thus the stress applied to the FPC when the lens barrel is moved back and forth can be reduced. Therefore FP
Less likely to damage C.

[Brief description of drawings]

FIG. 1 is a sectional view showing a photographing state in which a lens barrel of a lens shutter camera according to an embodiment of the present invention is extended.

FIG. 2 is a cross-sectional view showing a state in which a lens barrel is retracted inside a camera body.

FIG. 3 is a sectional view taken along the line I-I of FIG. 1.

FIG. 4 is a sectional view showing a housed state of a conventionally used FPC.

FIG. 5 is a cross-sectional view showing a housed state of a conventionally used FPC.

[Explanation of symbols for main parts]

 1 front lens group 2 rear lens group 3 front lens group holding member 4 rear lens group holding member 5 lens barrel 6 shutter device 6a shutter blades 6b front unit 6c rear unit 6d stepping motor rotor 6e stator 6f coil 11 flexible printed circuit board

Claims (2)

[Claims] 1. A first lens group facing a light-shielding blade and disposed on the side of a subject sandwiching the light-shielding blade, a first holding member for holding the first lens group, and a film sandwiching the light-shielding blade. A second lens group arranged on the surface side, a second holding member holding the second lens group, arranged outside the first and second holding members, and
And a lens barrel for moving the second lens group forward and backward in the optical axis direction, driving means for driving the light-shielding blades, and the driving means and an electric circuit provided in the camera body, which are electrically connected to each other. The lens barrel and the second holding member, wherein the lens barrel and the second holding member are provided with a flexible printed circuit board that transmits the signal to the driving means and that bends in response to the lens barrel moving in the optical axis direction. A lens shutter camera, characterized in that a space is provided between the flexible printed circuit board and the flexible printed circuit board, and the flexible printed circuit board is stored in the space. 2. The second holding member is a first film-side member.
The opening is formed larger than the second opening facing the light-shielding blade, and a part of the driving unit is arranged on the film surface side facing the light-shielding blade and sandwiching the light-shielding blade. The flexible printed circuit board, which is formed parallel to the light-shielding blade on the opening side, is housed in a space surrounded by the lens barrel, the second holding member, and the driving means. The lens shutter camera according to claim 1.