JPH04135076U - VTR integrated camera with anti-condensation device - Google Patents

Abstract

(57) [Summary] [Structure] A heating element is placed around the objective lens of a VTR integrated camera to heat the objective lens to prevent it from fogging up. Near the back of the fixed head and metal parts such as tape guides,
A heating element 20 is arranged to heat the fixed head and other metal parts so as not to cause dew condensation. Each heating element can be turned on and off by a manual switch 5. Additionally, a thermostat is placed near each heating element to control the heating temperature to be kept constant. [Effects] Deterioration of image quality due to fogging of the lens, dew condensation on the fixed head or other metal parts of the videotape, etc.
This has the effect of preventing damage to the tape or video head.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is based on the lens generated in VTR-integrated cameras or stationary VTRs. Try to prevent fogging and condensation on metal parts such as fixed heads and tape guides. heating them around or near areas where condensation is a problem. The present invention relates to a structure provided with a heating element.

0002

[Conventional technology]

VTR-integrated cameras and home VTRs (stationary VTRs) use rotating cylinders and Condensation on the fixed head or other metal parts may damage the tape or video head. Mau. Therefore, if dew condensation occurs on them, a dew condensation sensor (hereinafter referred to as a dew sensor) is used. ) is activated and has a function to stop the cylinder and tape running.

0003 The method of detecting dew condensation uses a certain type of resistor whose resistance value changes depending on the humidity. For example, when the humidity is 60%, a few kilohms becomes several hundred kilohms when condensed. Applying the characteristics, it determines whether to enter stop mode or not based on changes in voltage. be.

0004 Also, if you bring camera lenses etc. from a cold outdoors into a warm room, The surface becomes cloudy, making the subject blurry or difficult to see.

[0005] This phenomenon, called condensation or condensation, occurs when, for example, beer or beer is removed from the refrigerator. When you take out the juice bottle, water droplets form on the surface of the bottle after a while. It is also well known as

[0006] To remove condensation, leave it alone or blow warm air directly onto the condensed area. There are methods to evaporate the water, but if you leave it for one to two hours to remove it. It takes a considerable amount of time, and even if you want to dry it immediately by blowing warm air, it will not dry. When it takes about 20 to 30 minutes for the dew sensor to be released and you want to use it immediately. felt inconvenienced.

[0007] To prevent condensation, heat the area where the condensation will occur in advance to prevent it from getting cold, and prevent water droplets from forming. There are methods to make the cylinders thicker or to make them with materials that do not easily condense, but the rotary cylinders are Aluminum is optimal in terms of precision and processing, and camera lenses are also made of glass or Plastic is currently the best choice. All of these substances are prone to condensation. Ru. Therefore, this invention installed a heating element around or near these areas where condensation is likely to occur. This was an attempt to prevent condensation by preheating them in advance. .

[0008] In addition, as a measure to prevent condensation on the rotating cylinder, a heater is installed to heat the cylinder. Metal parts such as the lens body, fixed head, tape guide, etc. are already known. There is no example of preventing dew condensation.

[0009] As an example of this invention, a document that describes dew condensation is the NH of Japan Broadcasting Publishing Association. K home video technology "written by Katsuya Yokoyama" (P.158-P.159) is available.

0010

[Problem that the idea aims to solve]

The purpose of this invention is to solve problems such as camera lenses and fixed heads, as described in the conventional example above. Use a manual switch to turn it on or off near or around things that can cause problems if condensation occurs. Condensation can be prevented by installing a heating element that can be heated and preheating it before condensation occurs. This prevents fogging and allows for smooth operation.

[0011]

[Means to solve the problem]

In order to achieve the above purpose, the present invention is designed to be installed around the camera lens or fixed head. Install a heating element near the door or other metal parts to heat them (preheat them). Ru.

0012 In addition, a manual switch is provided to operate the condensation prevention function only when necessary. , which allows the heating element to be turned on and off, minimizing battery consumption. I tried to eliminate it.

[0013]

[Effect]

The heating element around the camera lens heats the lens body from the periphery. However, there are Once the temperature reaches a certain level, the thermostat will prevent the temperature from rising any further. control to prevent thermal deformation and thermal destruction.

[0014] Metal parts such as fixed heads and tape guides also heat themselves directly. this When heating the equipment, the temperature is controlled using a thermostat to prevent abnormal heating.

[0015] Furthermore, these heating elements can be turned on and off by manual switches, allowing for the necessary To minimize battery consumption, operate only at certain times.

[0016]

【Example】

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

[0017] FIG. 1 shows a cross-sectional view of the lens part of the VTR integrated camera shown in FIG. This includes a heating element 1 for anti-fogging (prevention of dew condensation), a thermostat 7 for temperature control, and a heating element 7 for temperature control. It has a built-in manual switch 5 for turning the heating element on and off.

[0018] For example, if you bring this VTR-integrated camera from a cold outdoors into a warm room, In this case, clouding (condensation) occurs on the objective lens 2 located at the outermost position. this cloudy To prevent this, it is sufficient to warm up the objective lens 2 in advance. To realize this, a heating element 1 for heating is provided around the objective lens 2.

[0019] As a result, the objective lens 2 becomes less likely to become cloudy, and the objective lens 2 becomes less likely to become cloudy due to rapid temperature changes. A clear captured image can be supplied to the camera sensor 4 even in a rural environment. Here, the objective Lens groups 3 other than lens 2 do not fog up because they are not in direct contact with the outside air. Also, The objective lens 2 is made of heat-resistant material such as heat-resistant glass so that it will not deform even if heated to a certain extent. Use quality. This dew condensation prevention device can be turned on and off using a manual switch 5. It can be turned off when unnecessary, reducing unnecessary consumption of the battery 8.

[0020] Heating element 1 is a ceramic heater or nichrome wire that generates heat when voltage is applied. In addition, a sensor is used to prevent abnormal heating of the objective lens, which is the heating element. Install Mostat 7 near the heating element to prevent damage to the lens due to excessive temperature rise. to prevent accidents.

[0021] The present invention further provides a heating element 20 as shown in FIG. L/The back of the audio head 22 or the metal parts of the tape guides 16, 17, etc. It is also possible to prevent dew condensation by installing it near the area. This is also manual switch 5 It can be turned on and off with the button to reduce battery consumption.

[0022] This invention is applicable not only to VTR-integrated cameras, but also to single-lens reflex cameras and stationary VTRs. It can be used to prevent fogging of lenses and condensation on metal parts, as well as to prevent moisture from condensed parts. It is also possible to remove qi.

[0023]

[Effect of the idea]

According to the present invention, a VTR-integrated camera can be moved from a low-temperature environment to a high-temperature, high-humidity environment. This prevents fogging of the lens and dew condensation on metal parts that may occur when the lens is Deterioration of captured images caused by fogging, or tape stuck to the fixed head or tape guide. No more wrapping around, and no damage to the tape or mechanism.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention;

[Fig. 2] An explanatory diagram showing the vicinity of the lens of the VTR integrated camera,

FIG. 3 is an explanatory diagram showing an embodiment of the present invention.

[Explanation of symbols]

1...Heating element for lens, 2...Objective lens, 4...Camera sensor, 5...Manual switch, 6...Camera body, 7...Thermostat, 8...Battery, 11...Rotating cylinder, 12...Fixed cylinder, 13...Cylinder rotation axis, 16, 17...tape loading arm, 20... Heating element for fixed head, 21...All erasing head, 22...CTL/audio recording/playback head.

Continuation of front page (72) Creator Naoki Fujiwara 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture Stock Within the company Hitachi Image Information Systems

Claims (3)

[Scope of utility model registration request] Claims: 1. A VTR-integrated camera including a camera unit for photographing a subject and a video tape recorder for recording and reproducing the same, including around a lens at the tip of the camera unit, near metal parts such as a fixed head and a tape guide; 1. A VTR-integrated camera with a dew condensation prevention device, characterized in that the camera is equipped with a heating element, and a metal part such as a lens, a fixed head, or a tape guide is heated or preheated by the heating element. 2. The VTR-integrated camera according to claim 1, having a dew condensation prevention device that turns on and off the heating element using a manual switch. 3. A VTR-integrated camera with a dew condensation prevention device according to claim 1, wherein said heating element is provided with a thermostat to control a temperature rise of said heating element.