Lens with lens barrel and production method for lens with lens barrel
A manufacturing method and technology for a lens barrel, which are applied in installation, optics, instruments, etc., can solve problems such as difficulty in obtaining air tightness stably, and achieve the effect of stable air tightness and stable acquisition.
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no. 1 approach
[0039] The first embodiment of the present invention will be described in detail with reference to the drawings. In addition, in order to make description easy to understand, a dimension is suitably changed in drawing, and a characteristic part is emphasized. figure 1 It is a sectional view showing the lens with lens barrel 1 of the first embodiment, figure 2 and image 3 is its partial enlarged cross-sectional view. As shown in the above-mentioned figures, the lens 1 with a lens barrel according to the present embodiment is composed of a lens barrel 10 and a lens 20 formed in a cylindrical shape. The lens 20 is a glass lens having a first optical surface 20a and a second optical surface 20b.
[0040] The lens barrel 10 is formed by cutting ferritic stainless steel. In addition, the lens 20 is formed by pressing a glass material within the lens barrel 10 . The stainless steel forming the lens barrel 10 uses a material having a linear expansion coefficient slightly larger...
no. 2 approach
[0067] Figure 8 It is a sectional view showing the lens 1 with lens barrel of the second embodiment, Figure 9 It is a sectional view showing the lens barrel 10 used in the lens 1 with the lens barrel. The difference from the first embodiment is the shape of the inner peripheral surface of the lens holding part 12 and the shape of the outer peripheral surface 21 of the lens 20 which is molded in contact with this shape. Other main structures and materials are the same as those of the first embodiment.
[0068] In the present embodiment, the first groove portion 12 a is formed as the inner peripheral surfaces of two cylinders having different inner diameters and an inclined surface (a part of a conical surface) that continuously connects the inner peripheral surfaces. However, in lathe processing for cutting these, it is set so as to form continuous grooves, and the cutting process is continuously performed so as not to deteriorate the surface roughness of the finished surfa...
no. 3 approach
[0072] Figure 10 It is a sectional view showing the lens barrel 10 used in the lens with a lens barrel 1 of the third embodiment. The difference from the first embodiment is the shape of the inner periphery of the lens holding portion 12 , more specifically, the shape of the protrusion 13 and the third groove 14 . Other main structures and materials are the same as those of the first embodiment.
[0073] In the present embodiment, the third groove portion 14 having a wider width than the first groove portion 12a and the second groove portion 12b is formed, and the third groove portion 14 goes around the inner peripheral surface of the lens holding portion 12 approximately once, and The first end portion 14a is provided continuously with the first protruding area 13a, and the second end portion 14b is provided continuously with the second protruding area 13b. It should be noted that cutting marks remain on the protruding portion 13 including the first protruding region 13a a...
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