Inner surface shape measuring apparatus
View Patent ↗An inner surface shape measuring apparatus that measures an inner surface shape of a tested object by using a light-section method includes: a projection section which includes an outer peripheral section having a tubular shape and having a slit that light is capable of penetrating and that is provided in a circumferential direction, and a light source unit having a light-emitting element and arranged in the outer peripheral section, the projection section projecting a luminous flux that has a predetermined thickness from the slit onto the tested object; and an imaging section which images the inner surface of the tested object with the luminous flux projected thereon.
1. An inner surface shape measuring apparatus that measures an inner surface shape of a tested object by using a light-section method, the measuring apparatus comprising:
a projection section which includes an outer peripheral section having a tubular shape and having a circumferential slit through which light is penetrable;
a light source unit which includes a light-emitting element and which is arranged in the outer peripheral section in a vicinity of the slit such that light emitted from the light source unit directly penetrates through the slit, whereby the projection section projects a luminous flux that has a predetermined thickness from the slit onto the tested object; and
an imaging section which images the inner surface of the tested object with the luminous flux projected thereon.
2. The inner surface shape measuring apparatus according to claim 1 , wherein the outer peripheral section includes a transparent tubular main body and a shielding section which is mounted so as to be slidable with respect to the main body, at least a portion of the shielding section having a light shielding property.
3. The inner surface shape measuring apparatus according to claim 2 , wherein the shielding section is configured with a plurality of shielding tubes having the light shielding property.
4. The inner surface shape measuring apparatus according to claim 1 , wherein:
at least a portion of the outer peripheral section has a light shielding property; and
the light source unit is mounted so as to be slidable with respect to the outer peripheral section.
5. The inner surface shape measuring apparatus according to claim 1 , wherein a plurality of light-emitting elements is arranged side by side in a circumferential direction of the projection section in the outer peripheral section.
6. The inner surface shape measuring apparatus according to claim 1 , wherein the light-emitting element is arranged on a central axis of the projection section such that a light-emitting surface of the light-emitting element faces a tip end side of the outer peripheral section.
7. An inner surface shape measuring apparatus that measures an inner surface shape of a tested object by using a light-section method, the measuring apparatus comprising:
a projection section which includes an outer peripheral section having a tubular shape and having first and second circumferential slits through which light is penetrable;
a light source unit which includes a light-emitting element and which is arranged in the outer peripheral section in a vicinity of the first and second slits such that light emitted from the light source unit directly penetrates through the slits, whereby the projection section projects two luminous fluxes with a shadow therebetween that has a predetermined thickness onto the tested object; and
an imaging section which images the inner surface of the tested object with the shadow projected thereon.
8. The inner surface shape measuring apparatus according to claim 7 , wherein the outer peripheral section includes a transparent tubular main body and a light shielding section mounted so as to be slidable with respect to the main body, the light shielding section having a light shielding property and inducing the shadow in between the first and second slits.
9. The inner surface shape measuring apparatus according to claim 8 , wherein the light shielding section comprises a plurality of shielding tubes having the light shielding property.
10. The inner surface shape measuring apparatus according to claim 7 , wherein the light source unit is mounted so as to be slidable with respect to the outer peripheral section.
11. The inner surface shape measuring apparatus according to claim 7 , wherein a plurality of light-emitting elements is arranged side by side in a circumferential direction of the projection section in the outer peripheral section.
12. The inner surface shape measuring apparatus according to claim 7 , wherein the light-emitting element is arranged on a central axis of the projection section such that a light-emitting surface of the light-emitting element faces a tip end side of the outer peripheral section.