JP2544356Y2 - Waterproof zoom lens camera - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention 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 back and forth in an optical axis direction.

[0002]

2. Description of the Related Art The applicant of the present invention has disclosed a camera having a camera body whose internal volume changes greatly due to zooming or the like, and having a breeze hole in the camera body for communicating the inside and the outside of the camera. We have proposed a drip-proof and waterproof camera that is equipped with an aqueous filter and that can be made drip-proof and waterproof for a camera whose internal volume changes greatly. This drip-proof waterproof camera (waterproof zoom lens camera) can perform zooming or focusing without increasing or decreasing the operation force due to the change in the internal volume by balancing the air pressure inside and outside the camera with the breathe hole. The air-impermeable and water-impermeable filter has a property of allowing water to pass therethrough but allowing air to pass therethrough, and is commercially available, for example, as a porous tetrafluoroethylene resin (trade name: Gore-Tex or Poreflon).

[0003] The waterproof zoom lens camera proposed by the present applicant has a limited zooming capability because only one stage of the taking lens can be zoomed, so that the waterproof zoom lens having a longer focal length is required. It is desired to realize a lens camera with a simpler structure.

[Purpose of the invention]

An object of the present invention is to provide a waterproof zoom lens camera having a longer focal length with a simple structure.

[Outline of the invention]

According to the present invention, which achieves the above object, there is provided a lens opening provided in a camera body, an intermediate barrel fitted to the lens opening so as to be able to advance and retreat in the optical axis direction, and an inner peripheral portion of the intermediate barrel. The zoom lens barrel itself having a waterproof structure fitted so as to be able to advance and retreat in the optical axis direction, first waterproof sealing means supported on the inner periphery of the lens opening and in contact with the outer periphery of the intermediate barrel, and on the inner periphery of the distal end of the intermediate barrel. A second waterproof sealing means supported and in contact with the outer periphery of the zoom lens barrel; and a cam ring that is rotationally driven and controls the advance / retreat position of the zoom lens barrel and the intermediate barrel. It is characterized in that the zoom lens barrel and the intermediate lens barrel are integrally moved until the lens barrel moves from the retreat end in the optical axis direction to the intermediate position in front.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on illustrated embodiments. FIG. 4 is a perspective view of the waterproof zoom lens camera 10 to which the present invention is applied. This waterproof zoom lens camera 10
The watertight camera body 11 has an intermediate lens barrel 1
2, and a watertight zoom lens barrel 15 is provided. The intermediate barrel 12 and the zoom lens barrel 15 are moved forward and backward in the optical axis direction by the zoom switch 13 to perform zooming. As a result, the contents in the camera body 11 including the intermediate barrel 12 and the zoom lens barrel 15 are obtained. The product changes.

The camera body 11 has a grip 14 on the front left side thereof, and a breeze hole 16 communicating the inside and outside of the camera body 11 is formed in a front curved surface of a grip wall surface constituting the grip 14. . The breeze hole 16 is closed by a gas-permeable and water-impermeable filter 17 having substantially the same curvature as the front curved surface portion. In addition, a semi-cylindrical cover 18 is attached to the front curved surface portion so as not to expose the gas-permeable and water-impermeable filter 17. The cover half-cylinder 18 is provided with a communication groove 32 for bringing the air-permeable and water-impermeable filter 17 into contact with the outside air, and a communication groove 32.
Has a notch 33 in which the upper and lower portions are cut.

Referring to FIG. 1, a description will be given of a so-called two-stage extending lens barrel which is a feature of the present invention. A fixed ring 26 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 positions of the fixed ring 26. A female multi-thread screw (not shown) is formed on the inner circumference of the fixed ring 26, and a male multi-thread screw formed on the outer circumference of the cam ring 31 fitted on the inner circumference side of the fixed ring 26. 50 is screwed into the female multiple thread. The cam ring 31 is further formed with an outer peripheral gear 25 parallel to the axis of the cam ring 31 at a part where the thread of a part of the male multi-threaded screw 50 on the outer periphery is removed. Also, the cam ring 31 is located in the direction in which the outer peripheral gear 25 extends,
An intermediate lens barrel advancing / retracting cam groove 23 having an inverted letter shape is formed, and a guide pin 2 provided on the inner periphery of the rear end of the intermediate lens barrel 12 is formed.
4 penetrates the linear guide groove 27 and moves the intermediate lens barrel forward / backward cam groove 2
3 is engaged. A power transmission gear 30 is meshed with the outer peripheral gear 25, and the power transmission gear 30 is linked to a zoom motor 28 via a reduction gear train 29.

In the inner circumference of the cam ring 31, an inner circumferential cam groove (not shown) for moving the zoom lens barrel 15 forward and backward when the cam ring 31 rotates.
Are formed. A guide pin (not shown) provided at the rear end of the zoom lens barrel 15 is engaged with the inner peripheral cam groove, and the zoom lens barrel 15 is straightly guided by straight guide means (not shown). Accordingly, the rotation of the cam ring 31 causes the zoom lens barrel 15 to move forward and backward in the optical axis direction. The inner peripheral cam groove formed on the inner periphery of the cam ring 31 and the intermediate lens barrel advance / retreat cam groove 23 formed on the outer periphery correspond to the retracted end of the zoom lens barrel 15 in the optical axis direction (the state shown in FIG. 1). ) To the middle position in front (state of FIG. 2)
The zoom lens barrel 15 and the intermediate barrel 12 are formed at such angles that the zoom lens barrel 15 and the intermediate barrel 12 can be moved integrally until the zoom lens barrel 15 is moved.

In the vicinity of the lens opening 34 in the inner peripheral portion of the fixed lens barrel 19, a first waterproof seal member 20 which comes into contact with the outer periphery of the intermediate lens barrel 12 to achieve watertightness between the lens opening 34 and the intermediate lens barrel 12 is provided. Is inserted. A second waterproof seal member 21 for contacting the outer periphery of the zoom lens barrel 15 for watertightness between the intermediate lens barrel 12 and the zoom lens barrel 15 is fitted into the inner circumference of the distal end portion of the intermediate barrel 12. It is rare.

Therefore, the waterproof zoom lens camera having the above-described configuration operates the zoom motor 28 by operating the zoom switch 13.
When the cam ring 31 is rotated in the forward direction via the reduction gear train 29 and the power transmission gear 30, the cam ring 31 is advanced by the female multi-thread screw on the inner periphery of the fixed ring 26, and , Guide pin 2 engaged with straight guide groove 27
4 is moved forward along the advance groove 23a of the intermediate barrel advance / retreat cam groove 23, whereby the intermediate barrel 12 is advanced. At this time, the zoom lens barrel 15 is advanced at the same speed as the advance speed of the intermediate barrel 12 by the guide pins being guided by the inner circumferential cam grooves of the cam ring 31. Therefore, the intermediate lens barrel 12 and the zoom lens barrel 15 are moved forward with respect to the fixed lens barrel 19 while keeping the second waterproof seal member 21 in an integral relationship without sliding. When moving to the state shown in FIG.
0 only causes a frictional force to act on the intermediate lens barrel 12.

From the state shown in FIG.
When the cam ring 31 is further rotated by the drive of 8, the cam ring 31 is further advanced with respect to the fixed ring 26, and at the same time, the zoom lens barrel 15 is further advanced with respect to the cam ring 31. Therefore, the second waterproof seal member 21 only exerts a frictional force on the outer periphery of the zoom lens barrel 15 during the movement up to FIG. When the zoom lens barrel 15 is advanced to the position shown in FIG. 3, the guide pin 24 is provided with a stop groove 23 whose inclination is opposite to that of the advance groove 23a of the intermediate lens barrel advance / retreat cam groove 23.
2b, it is held at the front end position of the straight guide groove 27, so that the intermediate lens barrel 12 does not move forward beyond the position shown in FIG.

Accordingly, when the first waterproof seal member 20 and the second waterproof seal member 21 are shifted from FIG. 1 to FIG. 2, respectively, the intermediate lens barrel 12 and the zoom lens barrel 1
5 moves forward at the same speed.
Only the frictional force of the first waterproof seal member 20 acts on the outer circumference of the second. When shifting from the state of FIG. 2 to the state of FIG. 3, only the frictional force of the second waterproof seal member 21 acts on the zoom lens barrel 15 that advances. That is, when the intermediate lens barrel 12 and the zoom lens barrel 15 move forward, the frictional force of the first waterproof seal member 20 and the frictional force of the second waterproof seal member 21 act only one by one.
The waterproof zoom lens camera 10 slides 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 while maintaining watertightness. In addition, the load on the zoom lens barrel 15 can be reduced to a minimum, and the operation can be facilitated.

On the other hand, when retracting the zoom lens barrel 15 toward the camera body 11, the zoom motor 28 is driven by operating the zoom switch 13 and the reduction gear train 29 is operated.
Then, the cam ring 31 is rotated in the backward direction via the power transmission gear 30. Then, the guide pin of the zoom lens barrel 15 is guided by the inner circumferential cam groove of the cam ring 31, and the cam ring 31 itself retreats with respect to the fixed ring 26, whereby the zoom lens barrel 15 is moved. It retracts to the position shown in FIG. At this time, the intermediate lens barrel 12 is moved
Since it is guided by the stop groove 23b of No. 3, it is stopped at the front end position of 27 and the state shown in FIG. 2 is obtained.

When the cam ring 31 further rotates in the same direction in the state shown in FIG. 2, the zoom lens barrel 15 is quickly retracted so as to enter the retracted cam ring 31.
At the same time, the forward groove 23a of the intermediate barrel advance / retreat cam groove 23
The guide pin 24 is guided backward by the straight guide groove 27, and the intermediate lens barrel 12 is retracted at the same speed as the zoom lens barrel 15. Therefore, when moving backward as well as when moving forward,
First waterproof seal member 20 and second waterproof seal member 21
Since a frictional force acts between the intermediate lens barrel 12 and the zoom lens barrel 15 one by one, the load is minimized.

[0016]

[Effects of the Invention] As described above, according to the waterproof zoom lens camera of the present invention, the zoom lens barrel can be protruded in two stages, so to speak, with a simple configuration, and the focal length of the waterproof zoom lens camera is increased. Offer can be realized. In addition, the cam ring moves the zoom lens barrel and the intermediate lens barrel together until the zoom lens barrel moves from the retracted end in the optical axis direction to the intermediate position in front of the zoom lens barrel. The frictional force between the means and the second sealing means can be applied one by one. As a result, a smooth operation can be provided by minimizing the load on the zoom lens barrel and the intermediate barrel during the reciprocation, and the sliding resistance is reduced, so that the load on the zoom motor can be reduced. it can.

[Brief description of the 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 the zoom lens barrel according to the present invention in an intermediately protruded state;

FIG. 3 is a cross-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]

 Reference Signs List 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) 26 fixed ring 23 intermediate mirror Cylinder advance / retreat cam groove 23a Advance groove 23b Stop groove 24 Guide pin 25 Outer gear 27 Straight guide groove 28 Zoom motor 29 Reduction gear train 30 Power transmission gear 31 Cam ring 34 Lens opening 36 Guide pin 50 Male multiple thread

Claims (1)

(57) [Scope of request for utility model registration] 1. A lens opening provided in a camera body;
An intermediate lens barrel fitted to the lens opening so as to be able to advance and retreat in the optical axis direction; a water-resistant zoom lens barrel itself fitted to an inner peripheral portion of the intermediate lens barrel so as to be able to advance and retract in the optical axis direction; First waterproof sealing means supported on the periphery and in contact with the outer periphery of the intermediate barrel; second waterproof sealing means supported on the inner periphery of the distal end of the intermediate barrel and in contact with the outer periphery of the zoom lens barrel; A cam ring for controlling the advancing / retreating positions of the zoom lens barrel and the intermediate barrel; and a cam ring for moving the zoom lens barrel from the retracted end in the optical axis direction to a forward intermediate position. A waterproof zoom lens camera, wherein the zoom lens barrel and the intermediate barrel are moved integrally.