JPH0545686U - Wiper for lens device - Google Patents

Abstract

(57) [Abstract] [Purpose] The objective is to reliably clean dirt on the front glass provided on the front surface of the lens device housed in the waterproof housing. A wiper member 25 is fixedly provided over the entire length of a filter 20 provided inside the front housing portion 13 at a position near an upper end portion of the filter 20 facing the front glass 15, and the wiper member 25 is used as a motor. By moving up and down by 24, the tongue piece 25a is brought into sliding contact with the front glass 15 to wipe off dirt such as cloudiness due to dew condensation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lens device wiper for maintaining a good lens field of view in a waterproof lens device for a television camera or the like.

[0002]

[Prior Art]

 The television camera is composed of a camera body and a lens device. As such a television camera, there is also a television camera which is installed, for example, in a structure in the field so that it can be photographed by a remote control operation. In a television camera installed outdoors like this, the camera body and the lens device are housed in a waterproof housing with a window for ensuring a field of view made of transparent glass on the front surface. The lens device and camera body are protected from direct exposure to rainwater.

[0003]

[Problems to be solved by the device]

 As described above, even if the entire equipment making up the television camera has a waterproof structure, it is not possible to completely prevent the ingress of moisture from the outside due to the fact that it is installed outdoors. In particular, in order to perform operations such as panning and tilting, it is necessary to reduce the weight of the waterproof housing, and due to the maintenance of internal equipment, a simple waterproof structure is inevitable. As a result, due to the temperature difference between the inside and outside of the waterproof housing and other effects, the internal moisture condenses on the surface of the windshield, causing fogging and other stains, which leads to a reduction in the image quality of the image. .. Among the front glass, the one to which a wiper is attached to clean the outer surface which is directly exposed to rainwater and dust and dirt may be attached has been widely used from the past. However, the current situation is that there is no means for cleaning the inner surface of the front glass.

The present invention has been made in view of the above points, and it is an object of the present invention to reliably remove dirt on the inner surface of the front glass even when the front glass of the lens device is condensed. Another object of the present invention is to provide a wiper for the lens device.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, according to the present invention, a movable member mounted on the inside of a windshield is equipped with a wiper member for wiping off the dirt on the inner surface of the windshield, and this movable member is attached to the field of view of a lens system. The feature is that the wiper member is slid on the front glass by moving the wiper member between the operating position located within the range and the retracted position from the field of view of the lens system.

[0006]

[Action]

 A filter such as a color temperature conversion filter or an ND filter is used for the lens device according to the shooting conditions, etc. However, when the lens device is housed in a waterproof housing, the filter is usually stored in this housing. It is installed. Since this filter needs to be displaced between the operating position within the range of the lens field of view and the retracted position avoiding from the field of view of the lens, if necessary, a driving means such as a motor is used for this filter. Is displaced in the direction along the surface of the windshield. In some housings, a turret for an interchangeable lens is provided in the housing, and the turret is rotated by a rotation driving means. The present invention makes the wiper member actuate by utilizing the actuation of movable members such as a filter and a turret provided in these housings, thereby making the structure complicated and large in size. Without a mechanism to clean the inner surface of the windshield. That is, when the inner surface of the front glass becomes cloudy due to dew condensation or the like, the movable member, for example, a means for driving the filter is operated to displace the filter from the retracted position to the activated position, and then returned to the retracted position again. During this time, the wiper member attached to the filter is brought into sliding contact with the inner surface of the front glass, so that dirt such as dew condensation and cloudiness is wiped off. As a result, the front glass is always kept clean and a clear image can be obtained. If a turret is provided, the turret can be rotated once to wipe off dirt.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The television camera is composed of a camera body and a lens device, and as shown in FIG. 1, the lens device 10 (and the camera body) is mounted in a waterproof housing 11. The waterproof housing 11 is composed of a main body housing portion 12 and a front housing portion 13 which is detachably attached to the main body housing portion 12 in order to enable the assembly and removal of the internal equipment. Is configured so that it can be locked to the main body housing portion 11 in a connected state by an appropriate locking means such as a hook. A seal member 14 is provided at the joint between the front housing portion 13 and the main body housing portion 12 to provide a simple waterproof structure.

The front housing portion 13 is composed of a frame body 13 a fitted in the front opening of the main body housing portion 12 and a front plate 13 b provided in the frame body 13 a. In order to secure the field of view, a front glass 15 is attached as shown in FIG. An outer surface wiper 16 for wiping off dirt such as rainwater, dust, and dirt is attached to the outside of the front glass 15. The outer surface wiper 16 is an arm 16a which is rotated by a drive shaft 17, and a wiper member 16b made of an elastic member such as rubber is attached to the arm 16a so as to be swingable. The rotation shaft 17 is a motor (not shown). It is possible to reciprocally rotate by a predetermined angle.

Next, a filter 20 is provided inside the front housing 13 part. The filter 20 is composed of a color temperature conversion filter, an ND filter, etc. according to the purpose and application, and is reciprocally displaced between an operating position facing the lens field of view and a retracted position retracted from the lens field of view depending on shooting conditions and the like. It is possible. For this reason, as shown in FIG. 3, the filter 20 can be raised and lowered along the side guides 21 and 21, and in order to raise and lower the filter 20 along the side guides 21 and 21, It is connected to a drive wire 23 wound around a pair of pulleys 22a and 22b. The drive wire 23 is driven to rotate by driving a drive side pulley 22a connected to a motor 24 so that the drive wire 23 is moved up and down. Is becoming The filter 20 is provided with a wiper member 25 fixedly provided along its entire length at a position near the upper end on the side facing the front glass 15. Similar to the wiper member 16b of the outer wiper 16, the wiper member 25 is made of an elastic member such as rubber, and when the filter 20 is moved up and down, its tongue piece 25a comes into sliding contact with the front glass 15. ..

The present embodiment is configured as described above, and its operation will be described next. In the following description, an ND filter is used as the filter 20, but it goes without saying that a filter having a function other than this can be used.

Thus, this television camera is fixedly installed outdoors and can be photographed by operating it by remote control. Here, when performing a normal shooting, the filter 20 is retracted from the position of the front glass 15 and is arranged at the position shown by the phantom line in FIG. Hold in the position Further, in the case of photographing in the state of receiving a strong light ray such as during the daytime, the motor 24 is operated and the drive wire 23 is sent in the direction shown by the arrow in FIG. As a result, the filter 20 rises and is displaced to the position indicated by the solid line in FIG. 1 where it overlaps with the front glass 15, and the amount of light incident on the lens device 10 decreases due to the operation of the filter 20, so that an appropriate amount is obtained. The amount of exposure. Further, when it is raining or when the front glass 15 is contaminated with dust, dirt or the like, the field of view of the lens device 10 can be secured by operating the outer wiper 16.

By the way, if a television camera is installed for a long period of time, moisture will penetrate inside. In particular, even if the seal member 14 for maintaining the airtightness is provided at the joint between the main body housing portion 12 and the front housing portion 13, it is extremely difficult to completely seal the joint. It is not possible to prevent rainwater, etc., from entering the area. Then, when shooting is performed with the television camera in a state where the outside air temperature is lowered, the inside temperature may rise and the inside moisture may be condensed on the inner side of the front glass 15 to become cloudy. Then, the motor 24 is operated to feed the drive wire 23 in the direction of the arrow in FIG. 3 to raise the filter 20 once, and then the feed direction of the drive wire 23 is reversed to lower the filter 20. When this operation is repeated once or a plurality of times, the tongue piece 25a of the wiper member 25 slides along the inner surface of the windshield 15, and this operation removes dew condensation or cloudiness on the inner surface of the windshield 15. As a result, a good field of view can be secured.

In the above-described embodiment, the wiper member 25 is attached to the filter 20 that reciprocates in the vertical direction, but when the rotary interchangeable lens is equipped with the turret. It is also possible to wipe off dirt by attaching a wiper member to this turret and rotating the turret. Further, although the structure in which the filter is driven up and down by the drive wire is shown, the lifting drive mechanism of this filter is not necessarily limited to this, and an appropriate means such as a rack-pinion mechanism may be used. it can.

[0014]

[Effect of the device]

 As described above, the present invention utilizes the movable member that is usually provided in the lens device, attaches the wiper member to the movable member, and slides the wiper member on the inner surface of the front glass. The structure is designed to remove the condensation and fog that occur on the inner surface, so the structure is extremely simple, and the front glass can be cleaned quickly and surely, and good shooting conditions can always be maintained. And other effects.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing the overall configuration of a television camera.

FIG. 2 is a front view of FIG.

FIG. 3 is an explanatory diagram of a configuration of a filter driving mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lens device 11 Waterproof housing 12 Main body housing part 13 Front housing part 15 Front glass 20 Filter 21 Side guide 23 Drive wire 24 Motor 25 Wiper member

Claims (1)

[Scope of utility model registration request] 1. A lens in which a lens system is mounted in a housing, a front glass made of transparent glass for guiding light is provided on the front surface of the housing, and a movable member is mounted inside the front glass so as to be displaceable by a driving means. In the device, a wiper member for wiping off the dirt on the inner surface of the front glass is attached to the movable member, and the movable member is provided with an operating position located within the range of the visual field of the lens system and a retracted position from the visual field of the lens system. A wiper for a lens device, wherein the wiper member is slid on the front glass by moving the wiper member between them.