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Tachometer

A speed and body technology, applied to devices using optical methods, using optical devices to transmit sensing components, etc., can solve the problems of limited design flexibility, the motor 71 cannot be operated at low speed, and the volume is too large.

Inactive Publication Date: 2007-12-19
THUNDER TIGER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] 1. The motor 71 cannot operate at low speed and has poor linearity
[0008] 2. The motor 71 consumes too much power, is too large, and is too heavy
[0009] 3. Design flexibility is limited by the characteristics (such as volume) of the motor 71 and the observation window 73. If the area of ​​the observation window 73 is to be increased, the volume of the motor 71 will correspondingly increase. In addition, since the observation window 73 is connected up and down, Therefore, when the position of the observation window 73 is to be designed, the components in the main body 7 such as the display window must be limited.

Method used

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Embodiment Construction

[0029] Please refer to FIG. 1 to FIG. 2 , the structure shown in the figure is the selected embodiment structure of the present invention, which is for illustration only, and is not limited by this structure in the patent application.

[0030] This embodiment includes: a main body 1 , a translucent liquid crystal screen 2 mounted on the main body 1 , and a frequency adjustment button set 3 .

[0031] The body 1 has a top surface 11 and a bottom surface 12 opposite to the top surface 11. The top surface 11 of the body 1 has a through display window 13 toward the bottom surface 12 of the body 1; wherein, the body also defines an adjacent On the side edge 14 of the top surface 11 and the bottom surface 12, the frequency adjustment button group 3 is arranged on the side edge 14 of the body 1, and the frequency adjustment button group 3 includes a frequency increase button 31 and a frequency decrease button 32, The user can adjust the output frequency of the light and dark images i...

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Abstract

A meter used for measuring rotary speed of rotating element is prepared as arranging an observation region on light-transmission liquid crystal screen set in meter body, using frequency regulation button to regulate said observation region to output bright-dark image as per preset frequency and periodically forming block on light transmitting through said observation region. Its method for measuring rotary speed of rotating element is also disclosed.

Description

technical field [0001] The invention relates to a speed machine, especially a speed machine for measuring speed through the parallax phenomenon produced by the human body itself having the characteristic of persistence of vision. Background technique [0002] At present, there are many technologies for measuring the rotational speed of objects. For rotating objects (such as fan blades), photoelectric tachometers can be used to measure the rotational speed. Photoelectric tachometers can be divided into two types, namely transmission and reflection. In the case of a transmissive photoelectric tachometer, when the fan blade rotates, the light receiver (such as a photoresistor, photoelectric crystal) is used to receive the natural light source relative to the other side of the fan blade, and the light source shines on the light receiver. The time interval of the fan blade (such as photoresistor and photoelectric crystal) is used to calculate the fan blade speed; and there is ano...

Claims

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Application Information

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IPC IPC(8): G01P3/36G01D5/32
Inventor 赖春霖
Owner THUNDER TIGER
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