JPH0740978Y2 - Zoom lens camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a compact zoom lens camera.

(Prior Art) In FIG. 6, reference numeral 1 denotes a camera body, and the camera body 1 is equipped with a zoom lens system 2. An exposure window 42 is provided behind the zoom lens system 2 in the camera body 1, and the film 3 is stretched in the exposure window 42.

6 and 7, reference numeral 5 indicates a rear fixing plate, and the rear fixing plate 5 is provided with four guide lots 7a, 7b, 9a, 9b. The rear lens group unit 11 is slidably inserted into the guide lots 7a and 7b.

The rear lens group unit 11 is provided with the lens 13 closest to the exposure window 42 of the camera body 1. A roller 15 is provided on the arm 12 of the rear group lens unit 11.

Reference numeral 29 indicates a cam ring, and a front group cam groove 31 and a rear group cam groove 33 are formed on the cam ring 29. The rear end of the cam ring 29 is rotatably attached to the rear fixing plate 5, and as shown in FIG.
Is inset.

Reference numeral 23 indicates a focus shutter unit, and at the rear end portion of the shutter unit 23, arm portions 25 and 26 projecting in the radial direction of the unit 23 are formed. The arm portion 25 is slidably inserted into the guide lots 9a and 9b.
The arm 25 is provided with a roller 27.
Is fitted into the front group cam groove 31 of the cam ring 29 as shown in FIG.

The front group lens unit 17 holding the lens 19 is provided with a helicoid 21, and the front group lens unit 17 is a focusing shutter unit by this helicoid 21.
23, screwed together.

The lens feeding lever 23a of the shutter unit 23 is engaged with the engaging portion 17a of the front lens unit 17. The lens feed-out lever 23a is operated by a pulse motor (not shown) in the circumferential direction of the shutter unit 23 at a constant angle.

Reference numeral 30 indicates a front fixing plate, and the front fixing plate 30 has four holes 32.
It is formed in some places. In this hole 32, guide lots 7a, 7b,
9a and 9b are respectively inserted, and the front fixing plate 30 is attached to the front end portion of the cam ring 29.

A sector gear 34 is fixed to the cam ring 29, and a pinion 38 of a motor 37 meshes with the sector gear 34.

With this zoom lens camera, the lens extension lever 23
a is rotated by a predetermined angle, the front lens group unit 17 is extended, and the focusing operation is performed.

The motor 37 operates, the power of this motor is transmitted to the sector gear 34 via the pinion 38, and the cam ring 29 rotates.

The rotation of the cam ring 29 causes the roller 27
Slides along the cam groove 31, and the roller 27 moves from point D to point E. By such operation, the shutter unit 23
At the same time, the front lens group unit 17 moves in the optical axis direction.
At the same time, the roller 15 slides along the cam groove 33, and the roller 15 moves from point A to point B. By such an operation, the rear group lens unit 11 moves in the optical axis direction, and a zooming operation for changing the zoom lens system 2 from the telephoto state to the wide-angle state is performed as shown in FIG.

(Problems to be Solved by the Invention) With the miniaturization of compact cameras, the distance between the lens 13 of the zoom lens system 2 and the film 3 stretched on the exposure window 42 is becoming shorter. Especially in the wide-angle state, the distance between the lens 13 and the film 3 is several millimeters, so when the film 3 is replaced, a finger touches the lens 13,
There is a risk that fingerprints may be attached to the lens 13 or dust may be attached.

(Means for Solving the Problem) The present invention has been made to solve the above-described conventional problems, and in a camera having a zoom lens system,
A zoom lens camera that includes a lens separation mechanism that moves the lens closest to the exposure window, out of the lenses that make up the zoom lens system, in a direction away from the exposure window in conjunction with the opening operation of the camera lid. is there.

(Operation) According to the present invention, since the lens separation mechanism is provided, when the lid is opened, the lens closest to the exposure window among the lenses forming the zoom lens system is exposed in conjunction with this opening operation. Moves away from the window.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

The zoom lens camera of the present invention has the same structure as the conventional example except that the zoom lens camera is provided with a lens separating mechanism in particular. Therefore, only the lens separating mechanism will be described in the embodiments, and the other examples will be described. The same reference numerals are given and the description thereof is omitted.

In FIG. 1, the film 3 loaded in the exposure window 42 faces the lens 13. On the back of the camera body 1, an exposure window
A back cover 44 as a cover for covering 42 is attached so that it can be opened and closed with the rear right end 1a of the main body 1 as a fulcrum.

A leaf switch 48 is provided on the back surface of the camera body 1. Details of the leaf switch 48 are shown in FIG.

In FIGS. 1 and 2, reference numeral 50 indicates a pressing contact having elasticity, a base end portion of which is fixed to the camera body 1 and a contact point 50a is provided at the front end portion. This pressure contact 5
At 0, the middle part is bent in a dogleg shape, and the pressing part 50b
Are formed. The pressing portion 50b slightly protrudes from the rear right end 1a of the camera body 1 and faces the upper end surface of the back cover 44.

A fixed contact 52 is provided in the camera body 1.
The fixed contact 52 has a contact 52a on which the contact 52a of the pressing contact 50 is attached.
Are formed so as to face each other.

As shown in FIG. 3, the pressing contact 50 and the fixed contact 52 are the CPU 5
Connected to 4. The CPU 54 is connected with a sensor 56 for detecting the zoom state of the zoom lens system 2, that is, the positions of the front lens group unit 17 and the rear lens group unit 11.

The CPU 54 is also connected to the motor 37 via a drive circuit 58.

The zoom lens system 2, the leaf switch 48, the CPU 54, the drive circuit 58, the motor 37, the pinion 38, and the sensor 56 constitute a lens separation mechanism.

Reference numeral 60 indicates the front lens group unit 17 and the rear lens group unit 11.
An external switch for driving is shown. By operating the external switch 60 during shooting, the front group lens unit 17 and the rear group lens unit 11 are driven so as to be in the telephoto or wide-angle state.

Next, the lens separation operation of the zoom lens camera of the embodiment will be described.

The sensor 56 detects the zoomed state, that is, the positions of the front lens group unit 17 and the rear lens group unit 11.

When the back cover 44 is opened to take out the film 3 in the camera after the photographing is finished, the pressing of the pressing contactor 50 by the back cover 44 is released, and the pressing contactor 50 returns by its own elastic force,
Contact 50a separates from contact 52a.

When the contact 50a separates from the contact 52a, the CPU 54 drives the drive circuit 58.
The motor drive signal is sent to. In response to this drive signal, the motor 37 operates, power is transmitted from the pinion 38 to the sector gear 34, the cam ring 29 rotates, and the roller 27 moves in the cam groove 31 from point E to point F. The reference numeral 15 moves in the cam groove 33 from the point B to the point C, and as shown in FIG. 4, the rear lens group unit 11 moves in the direction I shown in FIG. 4, that is, in the direction away from the exposure window 42.

Then, the film 3 is taken out from the camera body 1 with the rear lens group unit 11 largely separated from the exposure window 42.

After that, when the back cover 44 is closed, the pressing section is pressed by the back cover 44.
50b is pressed, the contact point 50a comes into contact with the contact point 50, a signal is issued from the CPU 54 to the drive circuit 58, the motor 58 operates, the zoom lens system 2 enters the wide-angle state, and the photographing preparation state is set.

FIG. 5 shows an embodiment in which there are three lens units. In this embodiment, when the back cover 44 is opened, the lens 57 closest to the film 3 is replaced by the other lens unit 11 by the same operation as in the above embodiment. At the same time, it moves in the I direction, that is, in the direction away from the exposure window 42.

(Effect of the Invention) As described above, according to the present invention, the lens separation mechanism that moves the lens closest to the film in the direction of separating from the film in association with the opening operation of the lid is equipped, so that the lens can be attached or removed when the film is attached or removed. It becomes possible to prevent fingerprints from attaching to and dust.

[Brief description of drawings]

FIG. 1 is a perspective view of a zoom lens camera of the present invention, FIG. 2 is a view showing details of a leaf switch, FIG. 3 is a view showing a configuration of a lens separating mechanism of the present invention, and FIG. 4 is a zoom of the present invention. FIG. 5 is a view showing the operation of the lens unit and the zoom operation when the back cover of the lens camera is opened, FIG. 5 is a view showing the operation of the lens unit of another embodiment, and FIG. 6 is the zoom lens mounted in the zoom lens camera. FIG. 7 is a sectional view of the system, FIG. 7 is a perspective view of the same, and FIG. 8 is a development view of a cam ring. 1 ... Camera body, 2 ... Zoom lens system, 11 ... Rear lens unit, 13 ... Lens closest to film, 42 ... Exposure window, 44 ... Back cover, 48 ... Leaf switch

Claims (1)

[Scope of utility model registration request] 1. A camera having a zoom lens system,
The zoom lens system includes a lens separation mechanism that moves a lens closest to the exposure window in a direction away from the exposure window in conjunction with the opening operation of the camera lid, among the lenses that form the zoom lens system. Zoom lens camera.