CN201970723U

CN201970723U - Compass with display screen

Info

Publication number: CN201970723U
Application number: CN2011200570505U
Authority: CN
Inventors: 洪福
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-03-07
Filing date: 2011-03-07
Publication date: 2011-09-14
Anticipated expiration: 2021-03-07

Abstract

The utility model particularly relates to a teaching compass with a display screen, which has high accuracy and is easy to use. The compass comprises a guide rail (3), a fulcrum (4) and a chalk sleeve (5). In an improvement, the compass also comprises a sliding sleeve (7) sleeved on the guide rail (3); one surface of the sliding sleeve (7) is provided with the liquid crystal display screen (2), the top part of the sliding sleeve is connected with a T-shaped handle (1), the bottom of the sliding sleeve is connected with an L-shaped connecting arm, the outer extended end of the connecting arm is connected with the fulcrum (4), and the triangular fulcrum (4) is made of an acrylic material. The compass has a simple structure and low cost, and is convenient and safe to use. When a capacitive sensor with high measurement accuracy is used with the display screen, the radius of a circle to be drawn can be read accurately.

Description

The compasses that have display screen

Technical field

The utility model belongs to the teaching equipment technical field, is specifically related to a kind of precision height, easy-to-use teaching with the compasses that have display screen.

Background technology

In existing, in the primary school math teaching, compasses for teaching is to use frequent a kind of teaching aid, but old-fashioned educational compasses is very simple, technology status has the following disadvantages: it is how next definite by estimating that (1) draws the bowlder radius of a circle, if accurately need by drawing circle with educational compasses again behind the prior measurement radius; (2) draw bowlder because of old-fashioned educational compasses structural instability, be easy to generate error during use; (3) center of circle fulcrum is provided with metal needle on the old-fashioned educational compasses, dangerously easily the student is damaged.Though compasses for teaching constantly improves, but the problem of various degrees.

The utility model content

In order to solve above three main deficiencies that compasses for teaching exists, the utility model provides a kind of precision height, easy-to-use teaching usefulness to have the compasses of display screen.

Concrete technical solution is as follows:

The compasses that have display screen comprise guide rail 3, fulcrum 4, chalk sleeve 5, and improvement is: also comprise the sliding sleeve 7 that is set on the guide rail 3; The one side of described sliding sleeve 7 is equipped with LCDs 2, and its top is connecting handle 1, and its bottom is connecting the linking arm of " L " shape, and the overhanging end of linking arm is connecting fulcrum 4.

Being shaped as of described handle 1 is "T"-shaped.

Described fulcrum 4 be shaped as triangle, material is an acrylic.

Useful technique effect of the present utility model is:

1 has used " capacitive sensor ", and the certainty of measurement height has been mixed display screen, can accurately read and will draw radius of a circle, easy to use, safe.

2 compasses have firm handle, and rotation is convenient, have guaranteed to draw the Stability Analysis of Structures of bowlder.

Used power supply is the button cell power supply on 3 compasses, and power consumption is low, if need not transfer the low consumption state automatically to for a long time, has the zero clearing reset function.

Description of drawings

Fig. 1 is the utility model structural representation.

Fig. 2 is the structural representation of the utility model sliding sleeve parts.

The specific embodiment

Below in conjunction with accompanying drawing, the utility model is further described by embodiment.

Embodiment:

Referring to Fig. 1, Fig. 2, have the compasses of display screen, comprise ruler shape guide rail 3, an end of guide rail 3 is provided with chalk sleeve 5, and chalk 6 is installed in the chalk sleeve 5; Sheathed sliding sleeve 7 on the guide rail 3, the one side of described sliding sleeve 7 is equipped with LCDs 2, and its top is connecting and is being shaped as "T"-shaped handle 1, and its bottom is connecting the linking arm of " L " shape, and the overhanging end of linking arm is connecting fulcrum 4.

Described fulcrum 4 be shaped as triangle, do not have the tip of needle-like, material therefor is an acrylic, has strengthened the security of compasses.

Capacitive sensor is a kind of novel sensor that grows up on the basis of capacitor sensor with changed area.It is when having the capacitance type sensor advantage, has the average effect that multipole electric capacity brings again, and adopt measuring circuit such as closed-loop feed-back type reduced parasitic capacitance influence, improved antijamming capability, improved certainty of measurement (can reach 0.01mm), greatly expanded range (can reach 1m), be a kind of rising sensor.

Capacitor plate in the capacitance sensor is carved into the grid sheet of definite shape and size, fixed grid is installed in the end that main body guide rail 3 is provided with chalk sleeve 5, moving grid is installed in LCDs inside, is equipped with corresponding signal processing circuit again, has just constituted appearance grid measuring system.Specific just palisade capacitor plate and unique measuring circuit make it surmount traditional capacitance sensor, the suitable large displacement measurement that carries out.

During use, hand-held handle 1, by being the center of circle on blackboard, the guide rail 3 in the moving sliding sleeve 7 is measured the distance of fulcrum 4 to chalk 6 by capacitive sensor the fulcrum 4 of compasses for teaching, and the numeral that shows on the LCDs 2 is radius value.Deng the numerical value that shows is required radius value, promptly hand-holdable handle 1 rotation, the circle of the standard of drawing on blackboard.

Claims

1. the compasses that have display screen comprise that guide rail (3), fulcrum (4), chalk sleeve (5) is characterized in that: also comprise the sliding sleeve (7) that is set on the guide rail (3); The one side of described sliding sleeve (7) is equipped with LCDs (2), and its top is connecting handle (1), and its bottom is connecting the linking arm of " L " shape, and the overhanging end of linking arm is connecting fulcrum (4).

2. the compasses that have display screen according to claim 1 is characterized in that: being shaped as of described handle (1) is "T"-shaped.

3. the compasses that have display screen according to claim 1 is characterized in that: described fulcrum (4) be shaped as triangle, material is an acrylic.