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Optical unit and endoscope provided with optical unit

An optical unit and optical system technology, applied to endoscopes, optical elements, optics, etc., can solve problems such as optical performance degradation, misalignment of the lens frame and element frame, and inability to obtain optical performance, preventing optical performance. Deterioration of performance, effect of satisfying adequate quality

Active Publication Date: 2017-02-22
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the conventional optical unit, there is a problem that when the lens frame and the element frame are fitted and fixed so that the focal position of the lens coincides with the light-receiving part of the imaging element, a problem occurs during the curing process of the bonding material. Due to the expansion and contraction of the lens frame and the element frame including the bonding material, the predetermined fitting position of the lens frame and the element frame is fixed so that the desired optical performance cannot be obtained.
[0007] In endoscopes in recent years, the increase in the number of pixels of captured endoscope images and the reduction in the diameter of the insertion part to improve insertion performance have been advanced. The device may use a small device, so the following problem has arisen: even if the deviation of the fitting position of the lens frame and the element frame is small, the appropriate quality of the optical performance cannot be satisfied or the optical performance will be deteriorated.

Method used

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  • Optical unit and endoscope provided with optical unit
  • Optical unit and endoscope provided with optical unit
  • Optical unit and endoscope provided with optical unit

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0041] First, an optical unit and an endoscope according to a first embodiment of the present invention will be described below with reference to the drawings.

[0042] in addition, figure 1 is a diagram showing the structure of an endoscope, figure 2is a cross-sectional view showing the structure of the optical unit, image 3 is shown along figure 2 Cross-sectional view of the structure of the optical unit of the line III-III, Figure 4 It is a sectional view showing the state before the fitting of the lens unit and the imaging device unit, Figure 5 is a cross-sectional view showing a state in which the lens unit and the imaging device unit are fitted and fixed by a welding portion, Image 6 is a cross-sectional view showing a state in which the lens unit and the imaging element unit are fixed by a bonding material, Figure 7 is a cross-sectional view showing the structure of the optical unit of the first modified example, Figure 8 is a cross-sectional view illustra...

no. 1 example

[0112] like Figure 11 As shown, the imaging unit 1 may also adopt a structure in which a bonding material 31 for airtightly (watertightly) bonding the lens unit 10 and the imaging element unit 20 is applied to a part of the front end surface of the fitting portion of the imaging element holding frame 12 The edge (edge) is solidified.

no. 2 example

[0114] like Figure 12 As shown, the imaging unit 1 may also have a configuration in which a recessed peripheral groove 12 a functioning as a bonding material reservoir (adhesive reservoir) into which excess adhesive or the like flows is formed in the imaging element holding frame 12 . In the inner peripheral portion, the excess adhesive is the bonding material 31 for bonding the lens unit 10 and the imaging device unit 20 airtightly (watertightly).

[0115] In addition, in this reference example, the peripheral groove 12a is provided in the inner peripheral portion of the imaging element holding frame 12 on the proximal side of the fitting portion, but it is not limited to this, and may be formed in the fitting portion of the imaging element holding frame 12. the inner periphery of the department.

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PUM

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Abstract

An optical unit (1) is provided with: a lens retaining frame (11) for retaining an objective optical system (13); an imaging element retaining frame (12) for retaining an imaging element (21) having a light-receiving part (21a) for detecting a subject image formed by the objective optical system (13), a first retaining frame being inserted and fitted in the imaging element retaining frame (12); a weld part (30) provided to a fitting part of the lens retaining frame (11) and the imaging element retaining frame (12), the weld part (30) for fixing the lens retaining frame (11) and the imaging element retaining frame (12) in a fitting position in which the light-receiving part (21a) and the image plane of the subject image from the objective optical system (13) coincide; and a joining material (31) for filling a gap formed between the lens retaining frame (11) and the imaging element retaining frame (12).

Description

technical field [0001] The present invention relates to an optical unit for an endoscope. The optical unit fits and fixes a lens frame and an element frame. Background technique [0002] In order to observe difficult-to-observe parts such as the inside of a living body or the inside of a structure, an endoscope that can be introduced into the inside from the outside of the living body or structure is used, for example, in the medical field or in the industrial field. Optical units such as camera units. [0003] An optical unit such as an imaging unit of an endoscope has: an objective lens that forms an image of a subject; at the imaging surface. [0004] Such an optical unit is known, for example, as an imaging unit disclosed in Japanese Patent Application Laid-Open No. 2002-238837. Usually, the lens frame and the element frame are fitted together, and then joined by soldering with a thermosetting adhesive or solder. The material is bonded and fixed. [0005] However, in...

Claims

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Application Information

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IPC IPC(8): A61B1/00G02B23/24G02B23/26
CPCA61B1/00G02B23/24G02B23/26G02B23/2476H04N23/55A61B1/005A61B1/00163A61B1/044A61B1/00097H04N23/51H04N23/54H04N23/555A61B1/00045
Inventor 西原辉幸
Owner OLYMPUS CORP
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