# US 7,609,364 B2 · Laser distance finder

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 7,609,364 B2
- Document ID: US7609364B2
- Status: Granted
- Kind: B2
- Application number: 12/006,527
- Filed: 2008-01-03
- Published: 2008-07-24
- Granted: 2009-10-27
- Earliest claimed: 2007-01-19
- Assignees: Chervon Limited
- Inventors: Yuzhong Zhao
- Web page: https://patentgrep.com/patent/US7609364B2

## CPC

- G01S 7/497: Means for monitoring or calibrating
- G01S 7/481: Constructional features, e.g. arrangements of optical elements
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

## Abstract

A compact, power-saving laser distance finder with high accuracy is disclosed having a laser generating device, a collimating lens in an emitting end direction of the laser generating device, a receiving lens, an optoelectronic detector, a reflective member rotatably mounted on an optical path of the collimating measuring beam via a rotating shaft and being capable of rotating to a blocking position and an non-blocking position. There is a transmission part on one end of the reflective member, the transmission part has an interval apart from an axis of the rotating shaft and engages with teeth of a worm driven by motor. When the reflective member reaches a predetermined position, it can be kept at that position through self-locking of the engagement between the worm's teeth and the transmission part without supplying power to the motor continuously, and a distance measuring is carried out and accuracy ensured.

## Claims

### Claim 1

A laser distance finder, comprising:
a laser generating device;
a collimating lens positioned in an emitting end direction of the laser generating device for converting a laser beam generated from the laser generating device into a collimating measuring beam;
a receiving lens for receiving a reflected measuring beam from an object to be measured and focusing it into an image;
an optoelectronic detector for receiving the image;
a reflective member rotatably mounted on an optical path of the collimating measuring beam via a rotating shaft and being capable of rotating to a blocking position and a non-blocking position around the rotating shaft;
a transmission part positioned on one end of the reflective member, the transmission part having an interval apart from an axis of the rotating shaft;
a worm having a plurality of teeth, wherein the transmission part engages with the teeth of the worm.

### Claim 2 (depends on 1)

A laser distance finder as claimed in claim 1, wherein the optoelectronic detector locates at a focus point of the receiving lens.

### Claim 3 (depends on 1)

A laser distance finder claimed in claim 1, wherein one end of the worm is connected to an output shaft of a motor.

### Claim 4 (depends on 1)

A laser distance finder as claimed in claim 1, wherein the transmission part of the reflective member is a pin which is inserted into a recess part of the teeth of the worm.

### Claim 5 (depends on 1)

A laser distance finder as claimed in claim 1, wherein the transmission part of the reflective member has a groove which engages with a protruding part of the teeth of the worm.