JPH0469638A - Water-proof camera - Google Patents

Abstract

PURPOSE:To reduce torque variation and torque difference and to extremely improve the effectiveness of a camera as a water-proof camera by coaxially arranging a knob for adjusting a distance and a knob for switching an autofocusing mode and a manual focusing mode on a lens barrel part and providing the packing for waterproofing of the knob which is positioned on an outer side inside the knob part of an operation member which is positioned on an inner side. CONSTITUTION:The knob 6 executes the switching of the manual focusing mode and the autofocusing mode. The distance adjusting knob 5 is provided with an O ring 11 which is attached in a ring state, the knob 6 coaxially arranged is provided with an O ring 13, and a diaphragm adjusting knob is provided with an O ring 28. In the case of the manual focusing mode, by rotating the knob 5, a bevel gear 17 is rotated and a bevel gear 18 is rotated. The gear 18 and a shaft 21 are regulated in a rotating direction and the shaft 21 is rotated and a gear 22 is also rotated. Then a male helicoid 24 is rotated and moves to an optical axis direction by its helicoid part 24b and the helicoid part 25a of a female helicoid 25 part, so that a photographing lens is extended to a desired distance. A shutter is opened by depressing a release and a film is exposed.

Description

[Detailed description of the invention] ■Industrial application fields] The present invention relates to an operating member for a waterproof camera.

[Conventional technology]

Until now, no waterproof camera had two or more coaxial operating members.

[Object of the Invention] The present invention has been made in view of the above circumstances, and includes a distance adjustment knob and a switching knob for autofocus mode and manual focus mode arranged coaxially on the lens barrel, and a knob located on the outside. A waterproof gasket is provided inside the knob of the operating member located inside to minimize the diameter of the shaft that fits into the lens barrel, suppressing torque fluctuations due to temperature etc., and reducing rotational torque. The present invention aims to provide a waterproof camera in which rotational torque can be made equal by making the packing diameters of both operating members the same.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a perspective view of a camera according to the present invention, and in FIG.
1 is a camera body, 2 is a lens barrel, 3 is a front glass, 4 is an aperture adjustment knob, 5 is a distance adjustment knob, and 6 is a manual-auto switching knob for switching between manual focus mode and autofocus mode. 7 is a rewind knob, 8 is a release button, and 9 is a winding lever. Figure 2 shows the internal structure of the lens barrel of the camera shown in Figure 1. In Figure 2, 11 is the 0 ring attached to the distance adjustment knob 5, and 12 is the manual/auto switching knob. Gear that is integrated with 6, 1
3 is an O-ring attached to the knob 6, and 15 is partially switched by a gear, which rotates around the shaft 2a. A lever 16 is bent at right angles and is fitted into the shaft 2a.

]7 is a bevel gear that is integrated with knob 5. Reference numeral 18 denotes a bevel gear which is fitted onto the shaft 21 of the motor, and is slidable in the axial direction but restricted in the rotational direction so that it rotates integrally with the shaft. 19 pushes the bevel gear 18 with a spring. 20 is the motor. 21 are motor shirts 1~. 22 is a gear, and 23 is a base plate that is fixed to the lens barrel 2.

A lens holder 24 holds a photographing lens 36. 24. A is a gear, and 24b is a helicoid screwed into the female helicoid 25. 25a is a female helicoid. 2
6 is the aperture blade, and 27 is the aperture blade base plate. 28 is the 0 ring glued to the aperture adjustment knob. 29 is a base plate fixed to the lens barrel 2. 30 is a bevel gear formed integrally with the knob 4.

31 is a shaft, and 32 is a bevel gear, which is rotatably supported by the shaft 3 and meshes with the bevel gear 30. A gear 34 is formed integrally with the bevel gear 31.

Reference numeral 35 is a barragin installed between the glass 3 and the lens barrel 2. 33 is a gear that drives the aperture 26.

A pulse plate 40 is attached to the shaft of the motor 2o and rotates integrally with the motor. 41 is a contact piece that is in contact with the pulse plate 40. FIG. 3 is a view of the gear 12, gear 15, and lever 16 shown in FIG. is regulated by the axis 2b of the lens barrel base plate. The lever 16 is rotatably inserted into the shaft 2a, but the other end 16
The c part is divided into two parts, and there is a gear 15 bin 15 a.
is engaged, so the lever 16 rotates together with the gear 15. 44 is a manual focus mode/auto focus mode identification switch. FIG. 5 shows the circuit configuration of the camera shown in FIG. 1. In FIG. 2, 42 is a control circuit composed of a microcomputer or the like, and 43 is a storage circuit. Incidentally, since the other configurations are the configurations shown in FIG. 2, the same numbers as in FIG. 2 are given and explanations thereof will be omitted.

Next, the operation of the above configuration will be explained.

1. In the case of manual focus mode, in the state shown in Figure 2, (1) Rotate the distance adjustment knob 5.

(2) The bevel gear 17 integrated with the distance adjustment knob 5 rotates.

(3) The bevel gear 18 meshing with gear 1.7 rotates.

(4) Since the bevel gear 18 and the shaft 21 are restricted in their rotational direction (for example, the shape of the shaft is square or a round shaft with a keyway cut into it), the shaft 21 rotates. At the same time, gear 22
It also rotates. Because the bevel gear 18 has a spring 19, the bevel gear 18 does not become disengaged from the bevel gear]7.

(5) As the gear 22 rotates, the male helicoid 24 meshing with it rotates. The male helicoid 24 has a helicoid part 24b, and the male helicoid 24 moves in the optical axis direction by the helicoid part 24b and the part 25a of the female helicoid 25 that meshes with the helicoid part 24b. Therefore, the photographer can extend the lens to a desired distance.

(6) In this state, the photographer presses the release button to open a shutter (not shown) and expose the film.

2. In the case of autofocus mode (1) In Fig. 1, turn the manual/auto switching knob 6 to the autofocus mode side (turn counterclockwise in Fig. 1).

(2) In FIG. 2, when the knob 6 turns, the gear 12 rotates, and the gear 15 rotates accordingly. In FIG. 3, since the gear 15 rotates counterclockwise, the bin 15a
also rotates together. Since the notch of the lever 16 fits into the pin 1.5a, the lever 16 also fits into the gear 15.
rotate with.

(3) Since the gear 15 has the notches 1.5b and 15c, after the gear 15 rotates to a certain extent, it hits the shaft 2b of the lens barrel base plate and stops rotating. At the same time, the lever 16 also stops rotating. In other words, the tip of the lever 16 has moved from the position shown in FIG. 2 to the position shown in FIG. 4.

(4) As the lever 16 moves, the gear 18 in contact with its tip 16b is pushed by the lever 6 and moves toward the optical axis as shown in FIG. 4, and the gears 18 and 17 are disengaged.

(5) At that time, the switch 44 is turned on and the camera enters autofocus mode.

(6) At this point, the photographer presses SWI with the first stroke of the release button.

(7) When the photometry and distance measurement operations are performed as well known and the subject distance is determined, the control circuit shown in FIG.
The drive control is performed.

(8) To control the drive of the photographic lens 36, as shown in the flowchart of FIG. 6, the motor 20 is first rotated in the reverse direction, and the shaft 21 and the gear 22 are rotated to return the photographic lens 36 to its initial position. During this time, the number of pulses required for the photographing lens 36 to return to its initial position is determined by the output of the pulse plate 40, and this number of pulses is stored in the memory circuit 43 as the lens focus position when switching from manual focus mode to autofocus mode. Remember.

Then, the motor 20 is rotated forward, and the pulse plate 4
The motor 20 is stopped when it is determined by counting the number of pulses from 0 that the photographing lens 36 has been driven to the lens focus position corresponding to the distance measurement result based on the count value of the number of pulses.

(9) Next, by the second stroke of the release button 8,
When W2 is pressed, a shutter (not shown) opens and the film is exposed.

(10) Next, when the manual/auto switching knob is returned to the manual focus mode side, in response to the switch 44 being turned off, the control circuit 42 reverses the motor 20 again as shown in the flowchart of FIG. Then, the photographing lens 36 is returned to the initial position, and then the motor 20 is rotated forward until the number of pulses from the pulse plate 40 reaches the number of pulses stored in the storage circuit 43, and the photographing lens 36 is stopped at this position. . As a result, when returning from autofocus mode to manual focus mode, the focus position of the photographing lens 36 at that time is the same as the position when switching from manual focus mode to autofocus mode, and the position of the lens indicated by the operating member is
It will always remain at the manual knob setting position without changing.

In addition, by turning the aperture adjustment knob 4, the gear 30
rotates. As a result, the full-tooth gear 32 meshing with the full-tooth gear 30 rotates, and the gear 34 integrated therewith also rotates. The gear 33 rotates according to the gear 34, and the aperture value can be changed by opening and closing the aperture 26 in the aperture drive unit 27.

In the above embodiment, the timing for driving the lens to the lens focus position that was memorized when switching from manual focus mode to autofocus mode was set to manual, and the timing was set to the time when the auto switching knob was returned to manual focus mode. However, the time may be different from the time when the shooting is completed. In that case, in the above embodiment, step #21 in the flowchart of FIG.
Instead of responding to the switch 44 being turned off, it is sufficient to respond to the completion of the release.

In the above embodiment, if the absolute position or driving direction of the photographic lens 36 is known from the output of the pulse plate 4o, the present invention can be carried out without returning the photographic lens 36 to the initial position each time as in the above embodiment. It goes without saying that this can be achieved.

[Effects of the Invention] As explained above, according to the present invention, by arranging the gasket of the outer operating knob inside the inner operating knob,
Torque fluctuations and torque differences can be reduced, making it extremely effective as a waterproof camera.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a camera showing an embodiment of the present invention, Fig. 2 is an internal configuration diagram of the lens barrel portion of the camera shown in Fig. 1, Fig. 3 is a partially enlarged view of A in Fig. 2, 4 is a diagram showing changes in the operation of FIG. 2, FIG. 5 is a circuit diagram of the camera of FIG. 1, and FIGS. 6 and 7 are flowcharts showing the operation of the circuit of FIG. 1 is a lens barrel, 5 is a distance adjustment knob, 6 is an autofocus/manual switching knob, 20 is a motor 40 is a pulse plate, and 44 is a manual focus mode/autofocus mode identification switch.

Claims (1)

[Claims] (1) The distance adjustment knob and the autofocus mode/manual focus mode switching knob are arranged coaxially on the lens barrel, and the waterproof gasket of the outer knob is placed inside the knob of the inner operating member. A waterproof camera characterized by: