Manufacturing method of front-end component of endoscope
First Claim
1. A method of manufacturing a front-end optical component in which a lens is mounted on the front end of a metallic lens-barrel provided on the front end of the inserting portion of an endoscope, comprising the steps of:
- placing a lens raw material on the front-end side in the lens-barrel,press-forming the lens raw material in a heat-softened state with a pair of upper and lower shaping dies,tightly joining the outer edge of the pressed lens raw material to the inner peripheral surface of the lens-barrel; and
wherein the front end of the lens-barrel is placed so as to straddle an outer periphery of a transfer surface shaped on a top surface of the lower die of said pair of upper and lower shaping dies, a guide die is provided so as to enclose the periphery of the lens-barrel, the upper die has a transfer surface shaped on a bottom surface thereof and is provided in the lens-barrel so as to able to be inserted in and withdrawn from it, a portion of the lens raw material press-formed by the upper and lower dies is formed projecting toward the front-end side of the lens-barrel from its inside, and the projection-shaped portion is polished and finished.
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Accused Products
Abstract
The invention relates to a method of manufacturing a front-end optical component of an endoscope realizing resistance to humidity. In the method of manufacturing a front-end optical component in which a lens is mounted on the front end of a metallic lens-barrel provided on the front end of the inserting portion of an endoscope, the configuration is made such that a lens raw material is placed on the front-end side in the lens-barrel, the lens raw material is press-formed in a heat-softened state with a pair of upper and lower shaping dies, thereby tightly joining the outer edge of the pressed lens raw material to the inner peripheral surface of the lens-barrel.
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Citations
12 Claims
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1. A method of manufacturing a front-end optical component in which a lens is mounted on the front end of a metallic lens-barrel provided on the front end of the inserting portion of an endoscope, comprising the steps of:
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placing a lens raw material on the front-end side in the lens-barrel, press-forming the lens raw material in a heat-softened state with a pair of upper and lower shaping dies, tightly joining the outer edge of the pressed lens raw material to the inner peripheral surface of the lens-barrel; and wherein the front end of the lens-barrel is placed so as to straddle an outer periphery of a transfer surface shaped on a top surface of the lower die of said pair of upper and lower shaping dies, a guide die is provided so as to enclose the periphery of the lens-barrel, the upper die has a transfer surface shaped on a bottom surface thereof and is provided in the lens-barrel so as to able to be inserted in and withdrawn from it, a portion of the lens raw material press-formed by the upper and lower dies is formed projecting toward the front-end side of the lens-barrel from its inside, and the projection-shaped portion is polished and finished. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of manufacturing a front-end optical component in which a lens is mounted on the front end of a metallic lens-barrel provided on the front end of the inserting portion of an endoscope, comprising the steps of:
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placing a lens raw material on a front-end side in a lens-barrel, press-forming lens raw material in a heat-softened state with a pair of upper and lower shaping dies, and tightly joining the outer edge of the pressed lens raw material to an inner peripheral surface of the lens-barrel; and wherein a guide die is mounted on the lower die having a transfer surface shaped on a top surface thereof, a step portion is shaped on an inner peripheral surface of the guide die, a flange portion shaped on an outer peripheral surface of the lens-barrel is engaged with the step such that the lens-barrel may be supported by the guide die, thereby shaping space between the front end of the lens-barrel and the lower die, the lens raw material is placed on the transfer surface of the lower die, the upper die having a transfer surface shaped on the bottom surface thereof is inserted into the lens-barrel to press-form the lens raw material, a portion of the press-formed lens raw material is formed projecting toward the front-end side of the lens barrel from its inside so as to cover the front end of the lens-barrel, and the projection-shaped portion is polished and finished except for the covered front end portion of the lens-barrel. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification