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Endoscope apparatus

An endoscope and circuit technology, applied to the field of endoscope devices, can solve problems such as the inability to hold electric charges, the inability to waveform-shape the voltage of the power supply voltage of the circuit, and the inability to ensure the stable operation of the imaging element.

Active Publication Date: 2014-10-15
EVIDENT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Since the stabilization circuit is limited in size, it is mainly composed of elements such as ceramic capacitors. When the drive frequency of the imaging element increases due to the increase in the number of pixels of the imaging element, etc., and the clock input to the waveform shaping circuit becomes high, the following problems occur: Problem: It is impossible to maintain a charge equivalent to the consumed current only through elements such as ceramic capacitors, and the power supply voltage of the waveform shaping circuit cannot be maintained at a constant voltage
[0009] During the period when the power supply voltage is unstable, the threshold voltage in the waveform shaping circuit also changes, so the amplitude and phase of the waveform output from the waveform shaping circuit deviate, so stable operation of the imaging element cannot be ensured.
As a result, in particular, when the period during which the power supply voltage of the waveform shaping circuit is unstable overlaps with the transfer period of the effective pixel region of the imaging element, fixed pattern noise is generated in the video and the image quality of the endoscopic image is degraded.

Method used

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no. 1 approach

[0026] (structure)

[0027] figure 1 It is a schematic configuration diagram of the endoscope apparatus according to the first embodiment of the present invention. In addition, in figure 1 Only the structure related to the present invention is shown in , and the structural elements not related to the present invention (for example, structural elements such as the bending control mechanism and the operation unit) are not shown.

[0028] The endoscope device 1 is configured by including an insertion portion 2 and a main body portion 3 connected to a proximal end of the insertion portion 2 . Here, although not shown, a monitor (not shown) for displaying endoscopic images is connected to the main body 3 .

[0029] In addition, the insertion portion 2 may be detachably connected to the main body portion 3 . In addition, a monitor (not shown) may be provided on the main body 3 itself.

[0030] A CCD image sensor (hereinafter referred to as CCD) 12 as an imaging element is provi...

Deformed example 1

[0059] In the first embodiment described above, the analog load circuit is provided in the main body 3 , but the analog load circuit may be provided in the front end 11 .

[0060] image 3 It is a schematic configuration diagram of an endoscope apparatus according to Modification 1 of the first embodiment. exist image 3 in, right with figure 1 The same symbols are attached to the same structural elements, and descriptions thereof are omitted. like image 3 As shown, in the endoscope apparatus 1A of the modified example, a constant current source 22 and a transistor 23 as an analog load circuit are arranged in the front end portion 11 of the insertion portion 2, and the signal line L5 for switching the signal HBLK is inserted into the insertion portion 2, One end of the signal line L5 is connected to the TG26 and the other end is connected to the gate of the transistor 23 .

[0061] In particular, if the waveform shaping circuit 13 and the constant current source 21 are c...

Deformed example 2

[0064] An endoscope apparatus 1B according to Modification 2 uses a current flowing through a dummy load circuit to emit light from a light emitting element such as a light emitting diode (hereinafter referred to as LED), and uses the light obtained by the light emission as a part of illumination light.

[0065] Figure 4 It is a schematic configuration diagram of an endoscope apparatus according to Modification 2 of the first embodiment. exist Figure 4 in, right with figure 1 The same symbols are attached to the same structural elements, and descriptions thereof are omitted. like Figure 4 As shown, the LED element 31 is connected in series to the constant current source 22 which is an analog load circuit. One end of a light guide 32 made of an optical fiber is disposed near the LED element 31 , and the light guide 32 is inserted into the insertion portion 2 . The other end of the light guide 32 is fixed to the front end of the front end portion 11 . The other end of t...

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Abstract

An endoscope apparatus has an insertion portion having an image pickup device in a distal end portion, and a main body portion. The endoscope apparatus has a waveform shaping circuit that is provided in the distal end portion of the insertion portion, a stabilizing circuit that stabilizes a power supply voltage to the waveform shaping circuit, a load circuit that is connected to a power supply line that supplies the power supply voltage of the waveform shaping circuit, and a current drawing circuit that draws a predetermined current to the load circuit from the power supply line in response to an operation state of the waveform shaping circuit so that a potential difference between a power supply voltage of the waveform shaping circuit in a non-operation time period of the waveform shaping circuit and a power supply voltage in an operation time period of the waveform shaping circuit becomes small.

Description

technical field [0001] The present invention relates to an endoscope device having an imaging element at a distal end portion of an insertion portion. Background technique [0002] Conventionally, endoscope devices have been widely used in industrial and medical fields. An imaging element is arranged at the front end of the insertion portion, and an endoscopic image captured by the imaging element is displayed on a display device connected to the main body portion of the insertion portion. [0003] In an endoscope, an imaging element such as a CCD is driven through a long and thin signal line inserted through the insertion part. Therefore, various clock signals such as horizontal transmission signals, which are high-speed signals, pass through the The waveform shaping circuit is input to the imaging element. [0004] Generally, the clock signal input to the waveform shaping circuit has a clock output period and a clock stop period. During the clock output period, a high-fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B23/24H04N5/225
CPCH04N5/23203A61B1/045H04N2005/2255G02B23/2484H04N5/23241H04N23/555H04N23/66H04N25/70
Inventor 横滨智洋
Owner EVIDENT CORP
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