Optical device, camera head and manufacturing method of optical device

Abstract

The invention provides an optical device, a camera head and a manufacturing method of the optical device, in order to prevent the decreasing of optical property caused by the fixing method of the optical elements. In a lens device (100) having a detaining ring (103) and a holding ring (116) which are adjacently arranged on an optical axis direction, the detaining ring (103) is made of a material that transmits at least part of laser light, and includes a first welding recess (109) caving in toward the holding ring (116) along the optical axis direction; the first welding recess (109) is formed on an aspect facing away from the holding ring (116) along the optical axis direction; the holding ring (116)is made of a material that is compatible with the material of the detaining ring (103) and that absorbs at least part of the laser light, and is fixed by laser welding to the detaining ring (103) at a position overlapping the first welding recess (109) along the optical axis direction.

Description

technical field [0001] The present invention relates to an optical device having a glass lens that needs to be adjusted or centered between planes, an imaging device having the optical device, and a method for manufacturing the optical device. Background technique [0002] In recent years, along with the demand for miniaturization of various devices with imaging functions such as mobile phones and compact cameras (hereinafter referred to as "imaging devices"), optical components such as lenses mounted on such imaging devices have been miniaturized or integrated by using multiple Optical devices (optical systems) made of such optical components tend to be miniaturized. In addition, in recent years, there is a tendency to increase the pixel count of imaging elements in small imaging devices such as mobile phones and compact cameras, and with the increase in pixel count of imaging elements, small and high-precision optical devices are expected. [0003] For example, in the cas...

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Problems solved by technology

[0007] In addition, since it is difficult to ensure the manufacturing accuracy of the optical component made of glass alone, it is difficult to provide a high-precision positioning structure on the optical component made of glass.

For example, in optical components made of glass, especially glass lenses formed by glass molding using glass materials, the eccentric accuracy of the front and back surfaces, the distance from adjacent lenses (plane distance), and the relative shape It is difficult to maintain a high degree of eccentricity accuracy of the optical surface

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