Aperture stop apparatus and optical apparatus
AssigneeCanon Kabushiki Kaisha
InventorKatsuhiko Sato
Life of this patent
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Abstract
An aperture stop apparatus configured to control a light amount in each of two optical systems arranged in parallel includes a drive gear, a single driving source configured to drive the drive gear, a base member, two aperture stops as iris stops each having three or more blade members, and two rotating members each including a gear portion engaged with the drive gear. Each aperture stop is operated as a corresponding one of the rotating members rotates. A rotation of a drive gear driven by the driving source is transmitted to the two rotating members through the gear portions provided to the rotating members and engaged with the drive gear.
Claims19
An aperture stop apparatus configured to control a light amount in each of a first optical system and a second optical system arranged in parallel, the aperture stop apparatus comprising:
- a drive gear;
- a single driving source configured to drive the drive gear;
- a base member configured to hold the driving source and having a first opening corresponding to the first optical system and a second opening corresponding to the second optical system;
- a first aperture stop configured to form an aperture for light passing through the first opening;
- a second aperture stop configured to form an aperture for light passing through the second opening;
- a first rotating member rotatable around a center axis of the first opening relative to the base member and including a gear portion;
- and
- a second rotating member rotatable around a center axis of the second opening relative to the base member and including a gear portion,
- wherein each of the first aperture stop and the second aperture stop is an iris stop having three or more blade members,
- wherein the first aperture stop is operated as the first rotating member rotates and the second aperture stop is operated as the second rotating member rotates, and
- wherein a rotation of the drive gear driven by the driving source is transmitted to the first rotating member and the second rotating member through the gear portions engaged with the drive gear.
An optical apparatus comprising:
- a first optical system;
- and
- a second optical system arranged in parallel to the first optical system;
- and
- an aperture stop apparatus configured to control a light amount in each of the first optical system and the second optical system,
- wherein the aperture stop apparatus includes:
- a drive gear;
- a single driving source configured to drive the drive gear;
- a base member configured to hold the driving source and having a first opening corresponding to the first optical system and a second opening corresponding to the second optical system;
- a first aperture stop configured to form an aperture for light passing through the first opening;
- a second aperture stop configured to form an aperture for light passing through the second opening;
- a first rotating member rotatable around a center axis of the first opening relative to the base member and including a gear portion;
- and
- a second rotating member rotatable around a center axis of the second opening relative to the base member and including a gear portion,
- wherein each of the first aperture stop and the second aperture stop is an iris stop having three or more blade members,
- wherein the first aperture stop is operated as the first rotating member rotates and the second aperture stop is operated as the second rotating member rotates, and
- wherein a rotation of the drive gear driven by the driving source is transmitted to the first rotating member and the second rotating member through the gear portions engaged with the drive gear.
Dependencies are inferred from the claim text.