JPH0584094U - Lighting system of discharge lamp and illumination structure of imaging tool for observation device using the same - Google Patents

Abstract

(57) [Abstract] [Purpose] To avoid shortening the life of lighting a discharge lamp with a DC power supply. Further, such a DC power source lighting type discharge lamp is applied to the illumination structure of the imaging device for an observation device to improve its functionality. In a lighting method of a discharge lamp which is lit by a DC power source, a relay 2 is interposed between a DC power source 1 and a discharge lamp 3, and the relay is controlled by a control means 4, whereby each of the discharge lamps is controlled. The polarity of the power supply applied to the electrodes 5a and 5b is changed according to the blinking operation. Further, the performance of the observation device is improved by using the discharge lamp of such a lighting system for the illumination structure of the imaging tool of the observation device of the video system system.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lighting method of a discharge lamp, in particular, a lighting method of a discharge lamp which is lit by a DC power source, and an illumination structure of an imaging device for an observation device using a discharge lamp of this lighting method as a light source.

[0002]

[Prior Art]

 For example, a video system type observing apparatus as shown in FIG. 3 has been conventionally known (JP-A-1-308527, JP-A-2-207401, etc.). The observing apparatus V includes an imaging system using a solid-state imaging device such as a CCD element, and an imaging system C including an illumination system for illuminating an observation site of the observing object M. It is designed so that this can be reproduced on the monitor display T for observation, and it is easy to carry out magnified observation at a high magnification of 20 to 1000 times without subjecting the observation object to any processing. For this reason, it has been widely used in various fields such as beauty, medicine, academics, and industry.

One of the important things in this video system type observing apparatus is that the observation area can be illuminated more strongly because the diaphragm is strengthened to achieve a large depth of focus. is there.

An illumination system for illuminating an observation site is built in the imaging tool as described above. As a light source of this illumination system, a powerful external light source is used to guide light with an optical fiber. There are a forming method and a method of directly incorporating the light emitting source itself.

In the case of the latter method with a built-in light emitting source, an incandescent lamp is used as the light emitting source, that is, a lamp, or a discharge lamp such as a fluorescent lamp is used. In the case of, there is an advantage that the amount of light can be nearly three times as high as that of an incandescent lamp based on the power consumption and the amount of heat generation, but on the other hand, there is flicker and the stability of the lighting condition is poor, and the generated noise is There is a disadvantage in that the wiring distance cannot be long because it adversely affects the imaging system. These disadvantages are caused by lighting the discharge lamp with an AC power supply, which is a normal lighting method, and therefore can be solved by lighting with a direct current power supply, but on the other hand, the life is half when using a DC power supply. This leads to a new problem, which is a bottleneck.

[0006]

[Problems to be solved by the device]

 Therefore, the object of the present invention is to make it possible to avoid shortening the life of lighting a discharge lamp with a DC power source, and to use such a direct current power source type discharge lamp for an observation device. The purpose is to improve the functionality by applying it to the illumination structure of the imaging tool.

[0007]

[Means for Solving the Problems]

 In the present invention, in the method of lighting a discharge lamp that is lit by a DC power supply, the polarity of the power supply applied to each electrode of the discharge lamp is changed in correspondence with the blinking operation, thereby eliminating the shortening of life. There is.

This is based on the finding that the shortened life of the DC power supply system is due to the doubled consumption due to the uneven use of the electrodes, and the polarity of the power supply is changed every blinking operation. Alternatively, it is possible to secure the same service life as in the case of the AC power supply method by switching the electrode every several times and averaging the usage status of the electrodes.

Further, the present invention is intended to improve the performance of the imaging tool by using the discharge lamp of such a lighting method in the illumination structure of the imaging tool of the video system type observation apparatus. That is, an image of an illuminated observation object is captured by an imaging tool, and this image is reproduced on a monitor and used for imaging in an observation device. A lamp is used, and the polarity of the voltage applied to each electrode of this discharge lamp is changed according to the blinking operation.

[0010]

【Example】

 An embodiment of this invention will be described below. In the method of lighting a discharge lamp according to the present invention, as shown in FIG. 1, a DC power supply 1 is connected to a discharge lamp 3 via a relay 2 for switching polarity, and the relay 2 is switched by a control means 4. By controlling the polarity of the voltage applied to each electrode 5a, 5b of the discharge lamp 3, the polarity can be alternately changed. That is, if the A contact of the relay 2 is used, the positive electrode is connected to one electrode 5a, and if the B contact is used, the positive electrode is connected to the other electrode 5b.

In this example, the polarity is changed every time a blinking operation is performed, that is, the electrode 5a is a positive electrode and the electrode 5b is a negative electrode, and the electrode 5b is a positive electrode and the electrode 5a is a negative electrode. The electrode 5a is a positive electrode and the electrode 5b is a negative electrode, and the polarity of the voltage connected to each electrode 5a, 5b is changed with each blinking operation.

Various mechanisms can be used as the switching control means 4 for performing such polarity conversion, but they can be roughly classified into a mechanical mechanism and an electronic mechanism. As an example of the mechanical mechanism, for example, a mechanism in which a latching relay is used in conjunction with the operation of the push button switch 6 for ON / OFF control of the circuit, and as an example of the electronic mechanism, There is a mechanism in which the polarity applied to the electrodes 5a and 5b for each lighting is stored in the storage means and the polarity is selected based on the storage of the storage means.

FIG. 2 shows an example in which a discharge lamp according to the above lighting method is used in the above-mentioned video system type observation apparatus. A discharge lamp, specifically a round shape, is provided at the tip of the imaging tool 10. The fluorescent lamp 11 is built in so that the observed portion of the observation object can be illuminated by the fluorescent lamp 11.

[0014]

[Effect of the device]

 According to the present invention, as described above, the life of the discharge lamp of the DC power supply type can be extended, and various advantages of the DC power supply type can be utilized more effectively. Further, according to the present invention, since such a DC power supply type discharge lamp is used as the light source of the imaging tool, a more powerful and efficient illumination structure can be obtained, and the video system type observation device can be obtained. The functionality of can be further improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a lighting method of a discharge lamp according to the present invention.

FIG. 2 is a perspective view of an imaging tool in the observation device according to the present invention.

FIG. 3 is a block diagram of a conventional observation device.

[Explanation of symbols]

 1 DC power supply 2 Relay 3 Discharge lamp 5a, 5b Electrode 10 Imaging tool 11 Fluorescent lamp (discharge lamp)

Claims (2)

[Scope of utility model registration request] 1. A discharge lamp lighting method in which a DC power supply is used for lighting, wherein the polarity of a voltage applied to each electrode of the discharge lamp is changed in correspondence with a blinking operation. Lighting method. 2. An image pickup tool captures an image of an illuminated observation object,
In the illumination structure in the imaging tool of the observation device configured to reproduce and observe this image on the monitor display,
A lighting structure characterized in that a direct current power supply type discharge lamp is used as a light emitting source, and a polarity of a voltage applied to each electrode of the discharge lamp is changed in accordance with a blinking operation.