JPH04116790U - optical distance measuring device - Google Patents

Abstract

(57) [Summary] [Purpose] This invention aims at an optical distance measuring device that can accurately measure the distance to an object. [Structure] The distance is displayed only when there is a distance measuring object 8 within the distance measurable range.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to an optical ranging device used in mobile ranging systems. be.

0002

[Conventional technology]

As a conventional technique, no known example applicable to the present invention has been found.

0003

[Problem that the idea aims to solve]

When there is no object to measure, the distance will not be displayed, and only the distance to the exact object will be displayed. This is the problem to be solved.

0004 In addition, it is possible to prevent erroneous display due to unnecessary data such as noise and light emitted from oncoming vehicles. This is the problem to be solved.

[0005] Furthermore, the driver can easily determine whether the displayed value is tracking the vehicle in front. The challenge is to make it possible.

[0006] Therefore, this invention was devised to solve the above problem and accurately target the The purpose of the present invention is to provide an optical distance measuring device that can measure the distance to an object.

[0007]

[Means to solve the problem]

In order to achieve the above purpose, the optical distance measuring device of the present invention is capable of measuring distance. The feature is that the distance is displayed only when there is an object to be measured within the range.

[0008]

【Example】

The embodiment will be explained with reference to FIGS. 1 to 4. FIG. 2 shows the system of this device. This is a block diagram in which a display unit 1, a controller 2, and a digital MIX are connected. Further, a light emitting section 5 is arranged on the driver 4 side, and a light receiving section 7 is arranged on the AMP side.

[0009] The light emitted from the light emitting unit 5 is reflected by the distance measurement target 8, and the light received by the light receiving unit 7 is The system is configured to measure the distance between cars based on the time difference.

0010

[Math 1]

[0011] Displaying and non-displaying of the display unit 1 is performed in the states shown in Table 1.

0012 And, it has the following structure from I to H.

[0013] B. The device is configured to display the distance only when there is an object to be measured within the measurable range. ing.

[0014] B. The maximum and minimum values of distance measurement data within a continuous period of time are memorized, and the difference between them is used as a standard. Compare it with the specified value, and if it is above the specified value, cancel the distance measurement data, and if it is below the specified value, The configuration is such that erroneous detection is prevented by enabling the detection if it exists.

[0015] C. In case B above, if you cancel the distance measurement data this time, the previous valid data will be The data is displayed continuously or for a certain period of time.

[0016] D. While valid data is being sampled, a letter or lamp will appear to indicate this. A buzzer or the like is provided and configured to turn off the buzzer in the state C.

[0017] For example, as shown in Figure 2, measurements with a distance measurement time of 2 msec are performed five times, and the distance measurement time is 90 msec. c When measuring with a pause pattern, the car in front is within the distance measuring range and the car in front is If the relative speed to the vehicle in front is 100km/h, , the distance moved during 5 measurements (10 msec) is approximately 28 cm.

[0018] Therefore, if the difference X between the maximum value and minimum value of the five measurement data is, for example, 50 cm or less, 5 times - The average value X of the data is displayed on the display unit 1 (FIG. 3).

[0019] Also, if X is 50cm or more, it is determined that there is no vehicle in front within the range measurement range, Do not display distance display (Figure 4).

[0020] Furthermore, in this case, the display is completely erased, but the previous data is held or It may be held for a certain period of time.

[0021] In addition, characters indicating whether or not the vehicle ahead is being measured, such as LOCKON, or , the lamp may be turned on or off. This display shows that the displayed value captures the vehicle ahead. The driver can easily determine whether the

[0022]

[Effect of the idea]

Since the present invention is configured as described above, it produces the following effects. Since the distance is not displayed when there is no object to measure, only the exact distance to the object is displayed. Can be displayed.

[0023] Furthermore, it is possible to prevent erroneous display due to unnecessary data such as noise and light emitted from oncoming vehicles. Furthermore, in the above case, although the display is completely erased, the previous data may be held or may be held for a certain period of time.

[0024] In addition, a character display indicating whether or not the vehicle ahead is being measured or You can turn the lamp on and off. Therefore, whether the displayed value captures the vehicle in front or not, The driver can be easily identified.

[Brief explanation of drawings]

FIG. 1 is a system block diagram of the present invention.

FIG. 2 is a timing chart of the present invention.

FIG. 3 is a front view of the display unit of the present invention.

FIG. 4 is a front view of the display unit of the present invention.

[Explanation of sign] 1 Display section 2 Controller 3 Digital 4 Driver 5 Light emitting part 6.AMP 7 Light receiving part 8 Object

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Takao Seto 2-17-8 Eda Minami, Midori Ward, Yokohama City, Kanagawa Prefecture 501 (72) Creator Hideki Kitamura 2-17-8 Eda Minami, Midori Ward, Yokohama City, Kanagawa Prefecture 301 (72) Creator Yasushi Seno 2-17-8 Eda Minami, Midori Ward, Yokohama City, Kanagawa Prefecture 402

Claims (1)

[Scope of utility model registration request] 1. An optical distance measuring device characterized in that a distance is displayed only when there is an object to be measured within a measurable range.