# US 11,112,677 B2 · Focal-plane shutter and imaging device

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- Number: US 11,112,677 B2
- Document ID: US11112677B2
- Status: Granted
- Kind: B2
- Application number: 16/777,810
- Filed: 2020-01-30
- Published: 2020-08-06
- Granted: 2021-09-07
- Earliest claimed: 2019-01-31
- Assignees: Nidec Copal Corporation
- Applicants: Nidec Copal Corporation
- Inventors: Yusuke Suzuki
- Web page: https://patentgrep.com/patent/US11112677B2

## CPC

- G03B 9/40: Double plate
- G03B 9/42: with adjustable slot; with mechanism controlling relative movement of plates to form slot
- G03B 9/14: Two separate members moving in opposite directions
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)

## Abstract

A focal-plane shutter for electronic front curtain scanning allows blades to move in two directions across the opening in a balanced manner, rather than in one direction. The focal-plane shutter for electronic front curtain scanning includes a base plate having an opening, a first blade movable in a first direction to close the opening, a second blade movable in a second direction to close the opening and opposite to the first direction in which the first blade is movable, a first urging member that urges the first blade in the first direction to close the opening, and a second urging member that urges the second blade in the second direction to close the opening.

## Claims

### Claim 1

A focal-plane shutter for electronic front curtain scanning, the shutter comprising:
a base plate having an opening;
a first blade movable in a first direction to close the opening;
a second blade movable in a second direction to close the opening, the second direction being opposite to the first direction in which the first blade is movable;
a first urging member configured to urge the first blade in the first direction to close the opening; and
a second urging member configured to urge the second blade in the second direction to close the opening, wherein
in image capturing,
from the state in which the opening is closed by the second blade, the second blade and the first blade move while leaving a gap for light to enter the opening,
after the opening is closed by the first blade, the first blade and the second blade move while leaving a gap for light to enter the opening, and
a scanning line of the electronic front curtain scanning moves within the gap.

### Claim 2 (depends on 1)

The focal-plane shutter according to claim 1, wherein
in image capturing, the first blade or the second blade closes the opening later than the electronic scanning line of the electronic front curtain.

### Claim 3 (depends on 1)

The focal-plane shutter according to claim 1, wherein
an image is captured when the first blade moves in the first direction across the opening and when the second blade moves in the second direction across the opening.

### Claim 4 (depends on 1)

The focal-plane shutter according to claim 1, further comprising:
a first electromagnetic actuator configured to drive the first blade; and
a second electromagnetic actuator configured to drive the second blade.

### Claim 5 (depends on 1)

The focal-plane shutter according to claim 1, wherein
at least one of the first blade or the second blade is driven by a drive spring in image capturing.

### Claim 6 (depends on 1)

An imaging device, comprising:
the focal-plane shutter according to claim 1.