JPH0564842U - Waterproof zoom lens camera - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a waterproof zoom lens camera having a longer focal length and having a simple structure. [Structure] A lens aperture provided in a camera body, an intermediate lens barrel fitted in the lens aperture so as to be able to advance and retreat in the optical axis direction, and itself fitted in an inner peripheral portion of the intermediate lens barrel so as to be further retractable in the optical axis direction. A waterproof zoom lens barrel, a first waterproof sealing means supported on the inner circumference of the lens opening and contacting the outer circumference of the intermediate lens barrel, and a second waterproof seal means supported on the inner circumference of the tip of the intermediate lens barrel and contacting the outer circumference of the zoom lens barrel. The waterproof sealing means, a first cam ring that is driven to rotate and controls the advance / retreat position of the zoom lens barrel, and a second cam ring that is driven to rotate and controls the advance / retreat position of the intermediate lens barrel. Further, the first and second cam rings move the zoom lens barrel and the intermediate lens barrel integrally until the zoom lens barrel moves from the backward end in the optical axis direction to the front intermediate position. Is configured.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a waterproof zoom lens camera, and more particularly to a waterproof zoom lens camera having a photographing lens that can move forward and backward in the optical axis direction.

[0002]

[Prior art and its problems]

 The applicant has provided a camera body with a large change in internal volume due to zooming or the like by forming a breeze hole in the camera body for communicating the inside and outside of the camera, and providing a breathable / non-permeable filter in the breeze hole. We proposed a drip-proof camera that made it possible to make the camera drip-proof and waterproof. This drip-proof waterproof camera (waterproof zoom lens camera) can perform zooming or focusing without changing the operating force due to changes in the internal volume by balancing the atmospheric pressure inside and outside the camera with the breeze hole. The air-impermeable, water-impermeable filter has a property of not allowing water to pass therethrough but allows air to pass therethrough, and is commercially available, for example, as a porous tetrafluoroethylene resin (trade name: Goretex or Poaflon).

By the way, the waterproof zoom lens camera proposed by the applicant of the present invention has a limited zooming ability because the shooting lens to be zoomed is only one stage, and the waterproof zoom lens has a longer focal length. It is desired to realize a lens camera with a simpler structure.

[The purpose of the device]

An object of the present invention is to obtain a waterproof zoom camera having a longer focal length and having a simple structure.

[Outline of the device]

The present invention that achieves the above object, therefore, has a lens aperture provided in a camera body, an intermediate lens barrel fitted in the lens aperture so as to be able to move forward and backward in the optical axis direction, and an inner peripheral portion of the intermediate lens barrel. A zoom lens barrel having a waterproof structure that is fitted so as to be able to move forward and backward in the optical axis direction, a first waterproof sealing means that is supported by the inner circumference of the lens opening and contacts the outer circumference of the intermediate lens barrel, and the inner circumference of the tip of the intermediate barrel. A second waterproof sealing means that is supported by and contacts the outer circumference of the zoom lens barrel; a first cam ring that is driven to rotate and controls the forward / backward position of the zoom lens barrel; and a second cam that rotates to drive the intermediate lens barrel. A second cam ring for controlling the advance / retreat position is provided. The first and second cam rings are provided for the zoom lens barrel until the zoom lens barrel moves from the retracted end in the optical axis direction to the front intermediate position. Lens barrel and intermediate barrel The feature is that they are moved together.

[0006]

【Example】

 The present invention will be described below with reference to illustrated embodiments. FIG. 4 is a perspective view of a waterproof zoom lens camera 10 to which the present invention is applied. A watertight camera body 11 of the waterproof zoom lens camera 10 is provided with an intermediate lens barrel 12 and a zoom lens barrel 15 having a waterproof structure, which is kept watertight. The intermediate lens barrel 12 and the zoom lens barrel 15 are moved back and forth in the optical axis direction for zooming by the zoom switch 13, and as a result, the contents inside the camera body 11 including the intermediate lens barrel 12 and the zoom lens barrel 15 are changed. The product changes.

The camera body 11 has a grip 14 on the front left side thereof, and a breeze hole 16 that communicates the inside and outside of the camera body 11 is formed in the front curved surface of the grip wall surface that constitutes the grip 14. There is. The breeze hole 16 is closed by a ventilation / non-water-permeable filter 17 formed to have substantially the same curvature as the front curved surface portion. Further, a cover semi-cylindrical body 18 is attached to the front curved surface portion so as not to expose the aeration / water impermeable filter 17. The cover half-cylindrical body 18 has a communication groove 32 for bringing the air-impermeable and water-impermeable filter 17 into contact with the outside air, and a notch 33 formed by cutting the communication groove 32 from above and below.

A so-called two-stage feeding type lens barrel, which is a feature of the present invention, will be described with reference to FIG. A fixed ring 53 is fixed to a fixed lens barrel 19 integrated with the camera body 11, and straight guide grooves 27 are formed at a plurality of points on the fixed ring 53. A second cam ring 42 for controlling the advance / retreat position of the intermediate lens barrel 12 is rotatably fitted to the inner circumference of the fixed ring 53. An inner peripheral gear 41 to be meshed with the power transmission gear 30 is formed at a rear end portion of the inner periphery of the cam ring 42. Further, the cam ring 42 has an intermediate lens barrel advancing / retreating cam groove 23, and the guide pin 36 provided at the rear end portion of the intermediate lens barrel 12 causes the intermediate lens barrel advancing / retreating cam groove 23 and the rectilinear guiding groove 27. Are penetrated through and engaged.

A fixed ring 40 is provided on the inner peripheral side of the cam ring 42 so as to be fixed to the camera body 11. The fixed ring 40 has a first cam for controlling the forward / backward position of the zoom lens barrel 15. The ring 54 is fitted. A male multi-thread screw 50 is formed on the outer circumference of the first cam ring 54, and this male multi-thread screw 50 is formed on the inner circumference of the fixed ring 40 by a female multi-thread screw (not shown). ) Is screwed together. In the first cam ring 54, a thread of a part of the male multi-thread screw 50 on the outer periphery thereof is removed, and an outer peripheral gear 25 parallel to the axis of the cam ring 54 is formed in this removed portion. A power transmission gear 30 is meshed with the outer peripheral gear 25, and the power transmission gear 30 is interlocked with a zoom motor 28 via a reduction gear train 29. A cam groove 34 is formed in the front end portion of the first cam ring 54, and a guide pin 51 (FIG. 3) provided on the outer periphery of the zoom lens barrel 15 is engaged with the cam groove 34. Since the zoom lens barrel 15 is guided linearly by the linear guide means (not shown), it moves forward and backward in the optical axis direction when the first cam ring 54 rotates. An intermediate lens barrel advancing / retreating cam groove 23 for controlling the advancing / retreating of the intermediate lens barrel 12 and a cam groove 34 for controlling the advancing / retreating of the zoom lens barrel 15 are used to advance / retreat the intermediate lens barrel 12 and the zoom lens barrel 15, respectively. The angles are set so that they can be performed at the same speed during the process.

A first waterproof seal member that contacts the outer peripheral surface of the intermediate lens barrel 12 near the lens opening 38 in the inner peripheral portion of the fixed lens barrel 19 to achieve watertightness between the lens opening 38 and the intermediate lens barrel 12. 20 is inserted. A second waterproof seal member 21 for contacting the outer circumference of the zoom lens barrel 15 with the inner circumference of the front end of the middle barrel 12 to ensure watertightness between the middle barrel 12 and the zoom lens barrel 15 is fitted. It is embedded.

Therefore, the waterproof zoom lens camera having the above structure drives the zoom motor 28 by operating the zoom switch 13, and the cam ring 42 is rotated in the forward direction via the reduction gear train 29 and the power transmission gear 30. Then, the cam ring 42 advances the guide pin 36, which is engaged with the rectilinear guide groove 27, along the intermediate lens barrel advancing / retreating cam groove 23, whereby the intermediate lens barrel 12 is advanced. At this time, since the first cam ring 54 is rotated in the opposite direction to the cam ring 42 by the power transmission gear 30, the male multi-thread screw 50 is formed on the inner circumference of the fixing ring 40. It is advanced by being sent forward by (not shown). Moreover, since the angles of the intermediate lens barrel advance / retreat cam groove 23 and the cam groove 34 are formed such that the intermediate lens barrel 12 and the zoom lens barrel 15 can be moved to the intermediate position at the same speed, respectively. The cam ring 54 and the second cam ring 42 connect the zoom lens barrel 15 and the intermediate lens barrel 12 until the zoom lens barrel 15 moves from the retracted end in the optical axis direction to the front intermediate position. Move them forward together to obtain the state shown in Fig. 2.

When the first cam ring 54 and the cam ring 42 are further rotated by driving the zoom motor 28 from the state shown in FIG. 2, the guide pin 36 of the intermediate lens barrel 12 moves the intermediate lens barrel forward / backward cam groove. The intermediate lens barrel 12 does not move any further because it is guided by the stop area 23a of 23 so as not to move any further. At this time, since the guide pin 51 is further guided by the cam groove 34 by the rotation of the first cam ring 54, the zoom lens barrel 15 projects and advances from the first cam ring 54 which itself advances. .. Therefore, the first waterproof seal member 20 and the second waterproof seal member 21 respectively move forward from the intermediate lens barrel 12 and the zoom lens barrel 15 at the same speed when shifting from FIG. 1 to FIG. Therefore, at this point, only the frictional force of the first waterproof seal member 20 acts on the outer circumference of the intermediate barrel 12. Further, at the time of shifting from the state shown in FIG. 2 to the state shown in FIG. 3, only the frictional force of the second waterproof seal member 21 acts on the forward moving zoom lens barrel 15, so that the intermediate lens barrel 12 and the zoom lens barrel are zoomed. During the forward movement of the lens barrel 15, the frictional forces of the first waterproof seal member 20 and the second waterproof seal member 21 act only on one side at a time. Therefore, in the waterproof zoom lens camera 10, the intermediate lens barrel 12 with respect to the fixed lens barrel 19 and the zoom lens barrel 15 with respect to the intermediate lens barrel 12 are made to slide while maintaining watertightness, and It is possible to reduce the load on the lens barrel 12 and the zoom lens barrel 15 to the minimum and to achieve smooth operation.

On the other hand, when retracting the zoom lens barrel 15 to the camera body 11 side, the zoom motor 28 is driven by operating the zoom switch 13, and the zoom gear 28 and the power transmission gear 30 are used to drive the zoom motor 28. One cam ring 54 and one cam ring 42 are respectively rotated in the reverse direction. Then, the guide pin 51 is guided by the cam groove 34 of the first cam ring 54, and the zoom lens barrel 15 retracts to the position shown in FIG. At this time, the cam ring 42 also rotates, but since the guide pin 36 of the intermediate lens barrel 12 is guided by the stop area 23a of the intermediate lens barrel advance / retreat cam groove 23, it does not move at that position. Then, when the first cam ring 54 and the cam ring 42 further rotate in the state of FIG. 2, the zoom lens barrel 15 quickly retracts as it enters the retracting first cam ring 54. At the same time, the guide pin 36 is guided and moved backward by the intermediate lens barrel advance / retreat cam groove 23 and the straight guide groove 27, and the intermediate lens barrel 12 retracts at the same speed as the zoom lens barrel 15. Therefore, when moving backward as well as moving forward, one of the first waterproof seal member 20 and the second waterproof seal member 21 rubs against the intermediate lens barrel 12 or the zoom lens barrel 15. Since the force is applied, its load is minimized.

[0014]

[Effect of the device]

 As described above, according to the waterproof zoom lens camera of the present invention, with a simple structure, the zoom lens barrel can be projected in two stages, so to speak, to provide a waterproof zoom lens camera with a longer focal length. You can Moreover, the first and second cam rings integrally move the zoom lens barrel and the intermediate barrel until the zoom lens barrel moves from the backward end in the optical axis direction to the front intermediate position. Therefore, the frictional forces of the first waterproof sealing means and the second sealing means can be applied one by one. As a result, the load on the zoom lens barrel and the intermediate lens barrel during forward / backward movement can be minimized to provide smooth operation, and the sliding resistance is reduced to reduce the load on the zoom motor. be able to.

[Brief description of drawings]

FIG. 1 is a sectional view showing a completely retracted state of a zoom lens barrel according to the present invention.

FIG. 2 is a cross-sectional view showing an intermediate protruding state of a zoom lens barrel according to the present invention.

FIG. 3 is a sectional view showing a completely protruding state of the zoom lens barrel according to the present invention.

FIG. 4 is a perspective view showing an entire waterproof zoom lens camera to which the present invention is applied.

[Explanation of symbols]

 10 waterproof zoom lens camera 11 camera body 12 intermediate lens barrel 13 zoom switch 15 zoom lens lens barrel 19 fixed lens barrel 20 first waterproof seal member (means) 21 second waterproof seal member (means) 23 intermediate lens barrel advance / retreat cam Groove 25 Outer peripheral gear 27 Straight guide groove 28 Zoom motor 29 Reduction gear train 30 Power transmission gear 34 Cam groove 36 Guide pin 38 Lens opening 40 Fixed ring 41 Inner peripheral gear 42 Second cam ring 50 Male multiple thread 51 Guide pin 53 Fixed ring 54 First cam ring

Claims (1)

[Scope of utility model registration request] 1. A lens aperture provided in a camera body;
An intermediate lens barrel fitted in the lens opening so as to be movable back and forth in the optical axis direction; A zoom lens barrel itself having a waterproof structure fitted in the inner peripheral portion of the intermediate lens barrel so as to be movable back and forth in the optical axis direction; First waterproof seal means supported on the circumference and in contact with the outer circumference of the intermediate lens barrel; second waterproof seal means supported on the inner circumference of the tip of the intermediate lens barrel and in contact with the outer circumference of the zoom lens barrel; A first cam ring for controlling the advancing / retreating position of the lens barrel; and a second cam ring that is driven to rotate and controls the advancing / retreating position of the intermediate lens barrel; A waterproof zoom lens camera characterized in that the zoom lens barrel and the intermediate lens barrel are moved integrally until the zoom lens barrel moves from a backward end in the optical axis direction to a front intermediate position.