JPH0446264Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a photographic camera, and particularly relates to an improvement of a camera that is provided with a barrier member inside the barrel of the photographic lens for opening and closing the front surface of the photographing lens.

[Prior Art] In recent cameras, when the camera is not in use, the front surface of the photographing lens is automatically covered with a barrier to protect the front surface of the lens.

Conventional barriers are configured to open and close in a plane perpendicular to the lens optical axis, so when installing the barrier inside the photographic lens barrel, a space for retracting the barrier when the barrier is opened must be created inside the lens barrel. Therefore, the outer diameter of the photographic lens barrel becomes large compared to the aperture of the photographic lens.
This hindered the miniaturization of cameras.

In order to solve the above-mentioned problems, an application is known as JP-A-56-106230, which has an arcuate barrier and is rotated manually from outside within the photographing lens barrel together with the viewfinder cover. . However, in this publication, the barrier has an arc shape, but the arc is gentle and has a large radius of curvature, and the rotation axis of the barrier is located behind the shutter blade, connecting the rotation axis and the barrier. The arm is provided at a sufficient distance in the normal direction to the optical axis so as not to interfere with the shutter blade even when the shutter blade is fully opened. Furthermore, when the barrier is retracted diagonally forward within the photographic lens barrel during photographing, a portion of the barrier moves beyond the fully opened shutter blade and to the rear of the shutter blade. Therefore, the inner diameter of the photographic lens barrel is at least equal to or larger than the outer diameter of the fully opened shutter blade plus the thickness of the arm or the barrier, which is insufficient for downsizing the photographic lens barrel. .

[Problems to be solved by the invention] As described above, by providing a barrier member inside the photographic lens barrel, the outside diameter of the photographic lens barrel becomes large, which is a problem that hinders miniaturization of cameras. An object of the present invention is to provide a camera that solves these problems.

[Means for Solving the Problems] The above-mentioned problem is that in a camera that is provided with a barrier member inside the barrel of the photographic lens that opens and closes the front surface of the photographic lens, the photographing lens is located between the front surface of the photographic lens and the shutter blade. It has a rotating shaft part provided perpendicular to the optical axis of the lens, and is curved along the direction of rotation around the rotating shaft part, and has a side surface of the photographing lens inside the lens barrel and the shutter blade. a barrier member that rotates between a storage space formed by the front side of the lens and the front surface of the photographic lens; a motor provided inside the lens barrel in front of the shutter blade; A lens driving mechanism is provided, the lens driving mechanism having the motor as a driving source that moves the photographing lens and transmits a driving force to the barrier member in a predetermined area within the movement area of the photographing lens to cause the rotation. The solution is to use a camera that does this.

[Embodiments] Hereinafter, details of embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a front view of an automatic focusing camera according to the present invention, and the camera is equipped with a focusing unit for measuring the focal length to a subject at the top of a photographing lens barrel B provided in the front of a camera body A. That is, the parfocal unit, which has a well-known structure, includes a light-emitting module _D1 that irradiates the subject with infrared light when the release button C is pressed in the first step, and a light-receiving module that calculates the distance to the subject from the reflection angle of the infrared light. A module _D2 is provided, and the position of a focus lens 1, which will be described later, is adjusted according to the focal length calculated by the light receiving module _D2 .

FIG. 3 is a sectional view of the above-mentioned photographic lens barrel B, which is positioned concentrically with respect to the lens optical axis α of the focus lens 1 that constitutes a part of the photographic lens. The first lens barrel member 2 has a large diameter, and the second lens barrel member 3 has a small diameter and is assembled inside the first lens barrel member 2. 4 is covered with a decorative cylinder 5. A disk-shaped first base plate 7 is fixed to the base of the first lens barrel member 2 by fixing screws 6 shown in FIG. A semicircular arc-shaped second base plate (mounting plate) 9 is fixed. As will become clear from the description below, a flexible printed circuit board 10 is laminated on the surface of the second base plate 9, and a focus control motor 1 is mounted on the flexible printed circuit board 10.
1. A photo interrupter 12 and a shutter control motor 13 are arranged and fixed as shown in the first figure.

Further, the exposure window 4 is covered with an openable and closable spherical barrier member 14 disposed inside the decorative tube 5. That is, as understood from FIG. 1, inside the photographing lens barrel B, the second base plate 9, which extends approximately halfway in the circumferential direction, is disposed, and the second base plate 9 is The barrier member 14 is formed by forming a notch 2a in a part of the first lens barrel member 2 on the opposite side.
A storage space 15 is formed in which the items can be stored. This barrier member 14 has a barrier rotation axis 16 in a plane perpendicular to the lens optical axis α of the photographic lens barrel B.
It opens and closes around A and 16B, and the third
As shown in the figure, the arm portions 14a and 14b at both ends of the barrier member 14 are inserted into the space between the first lens barrel member 2 and the second lens barrel member 3 from the distal end direction of the photographing lens barrel B. These arm portions 14a and 14b are pivotally supported on the second lens barrel member 3 by a pair of barrier rotation shafts 16A and 16B extending in the diametrical direction of the photographic lens barrel B, and one of the arm portions 14b is The barrier member 14 is opened and closed by the barrier opening/closing gear 17 that meshes with the teeth 14c, and the opening/closing protrusion 1 of the barrier opening/closing ring (opening/closing member) 18, which will be described in detail later, is connected to the barrier opening/closing gear 17.
A driven lever 19 driven by 8a is fixed.
As shown in FIG. 4, a return spring 20 and a return spring 21 are applied to the arm portion 14b and the driven lever 19 of the barrier member 14, respectively.
It is biased clockwise in the figure. Further, since the barrier opening/closing gear 17 is urged counterclockwise in FIG. The state is restored to the state shown by the solid line in the figure.

Furthermore, as shown in FIG.
B, 16A is provided in front of the camera from the position of the shutter blade 43, and when the barrier member 14 is rotated and stored, it is formed by the side surface of the lens holding frame 27 inside the decorative tube 5 and the front of the shutter blade 43. The barrier member 14 is housed in the space provided, and the barrier member 14 and the shutter blade 43 do not interfere with each other.

On the other hand, as shown in FIGS. 1 and 7, a focus control motor 11, a photo interrupter 1
2. The shutter control motor 13 is fixed. That is, the focus control motor 11 and the shutter control motor 13 are inserted into the mounting spaces 23 and 24 formed in the first lens barrel member 2 while preventing rotational movement, and their external connection terminals 11a and 13a are inserted into the mounting spaces 23 and 24 formed in the first barrel member 2. protrudes from the surface of the flexible printed circuit board 10 through the through hole 9a of the second base plate 9 shown in FIG.
By soldering these external connection terminals 11a and 13a to the surface of the flexible printed circuit board 10, electrical connection and mechanical fixation of the focus control motor 11 and the shutter control motor 13 are achieved. In addition, the rivet 25 shown in FIG.
The photointerrupter 12 fixed to the second base plate 9 has a light emitting element 12a and a light receiving element 12b facing each other in the vertical direction, and the leads 12c of the light emitting element 12a and the light receiving element 12b are connected to the flexible printed circuit board 10. It is soldered to the corresponding part. A photo interrupter 12 is attached to the drive shaft 11b of the focus control motor 11.
A slit disk 26 that crosses the optical path is fixed, and the number of rotations of the focus control motor 11, that is, the moving distance of the focus lens 1 in the direction of the lens optical axis α, is observed based on the signal from the photo interrupter 12.

As shown in FIG. 6, a lens holding frame 27 for holding the focus lens 1, which is movable in the direction of the lens optical axis α, is disposed inside the second lens barrel member 3, and the lens holding frame 27 is slidable. The protrusion 27a is slidably inserted into a guide groove 28 of the first lens barrel member 2 extending in a direction parallel to the lens optical axis α. The base 27b of the lens holding frame 27 is movable in the length direction between the first base plate 7 and the second base plate 9 while extending in a direction substantially parallel to the lens optical axis α. The feed screw rod 29 and the lens holding frame 27 are tightly fitted into the shaft portion 29a of the feed screw rod 29, which is supported by the feed screw rod 29, and between the base portion 27b and the second base plate 9. A biasing spring 30 is interposed to press in the direction to correct positional errors due to backlash. And the feed screw rod 2
9 has a feed screw portion 29b adjacent to the shaft portion 29a in the axial direction, and a female thread portion 31a of a spacer nut 31 is screwed to this feed screw portion 29b. gear 3
2, the focus control motor 11 is rotated by the drive pinion 33 of the focus control motor 11. This spacer nut 31 is a thrust bearing 34 having a pivot portion 34a that supports one end of the feed screw rod 29.
Rotatably supported by. Further, the other end of the feed screw rod 29 is supported by an optical axis adjusting plate 36 which is attached to the second base plate 9 so that its position can be adjusted by an eccentric cam screw 35.

A driving gear 37 that can rotate integrally with the spacer nut 31 is molded, and the driving gear 37 rotates integrally with the spacer nut 31.
7 rotates the barrier opening/closing ring 18 described above. As can be understood from FIG. 5, the barrier opening/closing ring 18 is rotatable around the lens optical axis α along a guide ring 38 fixed to the surface of the first base plate 7, and a portion of the inner circumferential surface thereof is rotatable. An inner circumferential tooth 18b that meshes with the drive gear 37 is formed in a portion thereof, and a driven end 19a of a driven lever 19 integrated with the barrier opening/closing gear 17 is formed in a portion adjacent to the inner circumferential tooth 18b. A facing opening/closing protrusion 18a is molded. Further, within the movement locus of the opening/closing protrusion 18a, as shown in FIG. 5, an initial position stopper 39 and a position reference stopper 40, which are formed from a part of the first base plate 7, are arranged. Therefore, when the opening/closing protrusion 18a of the barrier opening/closing ring 18 is in the position shown by the solid line in FIG. Further, when the opening/closing protrusion 18a is in the position shown by the imaginary line in FIG. 5 where it abuts against the position reference stopper 40, the focus lens 1 is placed at the reference focal position. Then, when the opening/closing protrusion 18a of the barrier opening/closing ring 18 is rotated from the above-mentioned initial position to the boundary position shown by the broken line in FIG.
The barrier member 14 will reach the open position shown in phantom in FIG.

The shutter control motor 13 is constituted by a reversible DC motor, and based on the light value detected by the AE detection element, the shutter control motor 13 moves the shutter ring 42 once through the reduction gear 41 to perform the shutter operation. The blade 43 is opened and closed.

Since the autofocus camera according to the illustrated embodiment has the above-described structure, a semicircular arc-shaped second base plate 9 (mounting plate) is provided inside the photographic lens barrel B, and the second base plate 9 is fed to the second base plate 9. Threaded rod 29, autofocus camera, shutter control motor 13, reduction gears 32, 4
1 is assembled, and the barrier member 14 is stored in the storage space 15 formed on the opposite side of the second base plate 9, so the outer size of the photographic lens barrel B can be reduced. In addition, by simply soldering the external connection terminals 11a and 13a of the focus control motor 11 and the shutter control motor 13 to the flexible printed circuit board 10 on which the photo interrupter 12 is arranged, the focus control motor 11 and the shutter control motor 13 can be
Since the electrical connection and mechanical fixing are both performed, the assembly process and the electrical connection process can be simplified, and a structure that is highly suitable for mass production can be obtained.

When actually taking a photo, the focus control motor 11 is driven by pressing down the release button C.
The reduction gear 32 and the spacer nut 31 are rotationally driven, and the spacer nut 31 drives the feed screw rod 2.
9 is sent in the length direction, and the lens holding frame 27 is moved from the reference position to the measured focal position through the infinite distance focal position. That is, when the main switch is turned on, the focus control motor 11 is started, and the barrier opening/closing ring 18 is rotated counterclockwise in FIG. Ru. Therefore, during the run-up section of the focus lens 1 toward the same reference position, the opening/closing protrusion 18a of the barrier opening/closing ring 18 is moved to the driven lever 19.
The barrier member 14 is rotated about the barrier rotating shafts 16A and 16B via the barrier opening/closing gear 17, and the barrier member 14 is opened to the state shown in the fourth figure. During this time, the number of rotations of the focus control motor 11 and, in particular, the distance traveled by the focus lens 1 in the direction of the lens optical axis α are observed by the photo interrupter 12 which detects the number of rotations of the slit disk 26, and the photo interrupter 12 detects the number of rotations of the slit disk 26. If the number of rotations is not counted within a specified time, it is determined that a malfunction has occurred, and subsequent autofocus and shutter operations are canceled. Therefore, when the release button C is pressed down, before the opening/closing protrusion 18a of the barrier opening/closing ring 18 rotates from the position shown by the two-dot chain line to the position shown by the broken line in FIG. Focus control motor 11 calculated by
The focus control motor 11 is stopped at the number of rotations (corresponding to the moving distance of the focus lens 1 according to the distance to the subject), the automatic focusing operation is completed, the shutter control motor is started, and the calculation is performed by the AE mechanism. The shutter blade 43 is moved back and forth for the duration of time.

Further, after the shutter operation is completed, the focus control motor 11 mentioned above is reversed, and the barrier opening/closing ring 18 returns counterclockwise in FIG. , the film is wound. Also,
When the main switch is turned off in this standby state, the focus control motor 11 is activated by the barrier opening/closing ring 18.
is rotated in the clockwise direction in FIG. In this case, when the barrier member 14 is returned to the closing direction, even if an accident occurs such as a foreign object being caught between the barrier member 14 and the exposure window 4, the barrier member 14 is immediately removed after the obstacle is removed. 14 is in the closed state. In other words, when the focus lens 1 returns to its initial position, the barrier opening/closing ring 18 returns to its initial position independently of the driven lever 19 and the barrier member 14, so the opening/closing protrusion of the barrier opening/closing ring 18 18a has already been retracted from the movement range of the driven lever 19, so when the abnormal situation is resolved, the return spring 20
The force of the return spring 21 returns the barrier member 14 to the closed position.

[Effects of the invention] As is clear from the above explanation, according to the invention, the barrier rotation shaft is provided in front of the shutter blade, so that the arm that connects the barrier and the rotation shaft is located outside the shutter blade when fully opened. The arm dimensions do not affect the outer diameter of the lens barrel.

In addition, when storing the barrier, the barrier is stored in a position in front of the shutter blade, so the barrier does not move outward from the shutter blade when fully opened, and the outside diameter of the lens barrel is determined by the shutter blade. No barrier thickness is added to the dimensions.

Furthermore, since the motor, which is the drive source for rotating the barrier member, is installed in front of the shutter blade, there is no need for a mechanical connection to the camera body, and the camera body and the motor can be connected only through electrical connections such as lead wires. The shutter blade does not interfere with the connection between the motor and the main body.

Therefore, the outer diameter of the lens barrel is not determined by the addition of the shutter blade when fully opened and the barrier member, and it is possible to realize a compact camera in which the lens barrel does not become thicker even if the barrier member is built-in.

Furthermore, since one unit can be constructed as a photographic lens barrel with a built-in barrier member, assembly and adjustment work can be performed by the unit alone, and a structure that is highly suitable for mass production can be obtained.

[Brief explanation of the drawing]

Figure 1 is a sectional view taken along the - line in Figure 3;
The figure is a front view of the autofocus camera according to the present invention.
The figure is an enlarged sectional view taken along the - line in Fig. 1, Fig. 4 is a sectional view roughly taken along the - line in Fig. 1, Fig. 5 is a sectional view taken roughly along the - line in Fig. 3, and Fig. 6 is a sectional view taken roughly along the - line in Fig. 1. A sectional view taken along the - line in Fig. 1, and Fig. 7 is a sectional view taken along the - line in Fig. 5.
It is a developed cross-sectional view along the line. α...Lens optical axis, B...Photographing lens barrel, 9
... Second base plate (mounting plate), 11 ... Focus control motor, 13 ... Shutter control motor, 1
5... Storage space, 32, 41... Reduction gear.

Claims (1)

[Scope of Claim for Utility Model Registration] In a camera equipped with a barrier member for opening and closing the front surface of the photographing lens inside the lens barrel of the photographing lens, there is provided a barrier member between the front surface of the photographing lens and the shutter blade at right angles to the optical axis of the photographing lens. A housing having a rotating shaft provided therein, curved along the direction of rotation around the rotating shaft, and formed by a side surface of the photographing lens inside the lens barrel and a front side of the shutter blade. a barrier member that rotates between a space and the front surface of the photographing lens; a motor provided inside the lens barrel in front of the shutter blade; and a motor that moves the photographic lens in the optical axis direction and performs the photographing operation. A camera comprising: a lens drive mechanism whose driving source is the motor that transmits a driving force to the barrier member in a predetermined region within a lens movement region to cause the barrier member to rotate.