Light-sensing Electronic Stylus

Abstract

An embodiment of the present invention discloses a light-sensitive electronic touch pen, which includes a pen barrel, a pen core, a pen tip cap, and a main bracket. A friction sleeve for sleeving on the pen core is provided inside the pen barrel. The inner wall of the friction sleeve is provided with bumps, and a preloading spring for applying a preloading force to the friction sleeve is correspondingly provided at the end of the friction sleeve. A lever that rotates around a rotating shaft is provided on the main bracket; one end of the lever is correspondingly provided with a light signal transceiver sensor, which includes a light signal transmitting end and a light signal receiving end. The light signal transmitting end and the light signal receiving end are correspondingly provided on both sides of one end of the lever; the other end of the lever contacts the friction sleeve during writing. The present invention uses the friction sleeve to transmit the writing pressure of the pen core, and uses two light signal transceiver sensors to detect and calculate the writing pressure, which can adapt to pen cores of different lengths, facilitate users to replace, has a simple structure, convenient assembly, and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic pens, and particularly to a light-sensing electronic touch pen. Background Art

[0002] Existing electronic touch pens are becoming more and more intelligent. Existing electronic touch pens can not only write normally on coded paper with an ordinary ballpoint pen, but also use a camera inside the pen to capture the trajectory of the pen tip, synchronously process it into an electronic document, and at the same time transmit the magnitude of the pressure applied by the pen tip to a pressure element inside the electronic touch pen. However, there are generally the following two ways to collect the pressure of the pen tip contact in existing electronic touch pens:

[0003] 1. The pressure element is correspondingly arranged at the tail of the pen core to detect the writing pressure transmitted from the tail of the pen core. However, this method has requirements for the length of the pen core. If the user replaces the pen core with a different length, it cannot be detected.

[0004] 2. The pressure element is correspondingly arranged at the front end of the pen core to detect the writing pressure transmitted from the convex ring at the front end of the pen core. However, this method will increase the number of front-end devices of the electronic touch pen, resulting in a complex structure, and further making the electronic touch pen appear very bulky, unsightly and affecting the user's writing. Summary of the Invention

[0005] The technical problem to be solved by the embodiments of the present invention is to provide a light-sensing electronic touch pen to simplify the structure and at the same time be applicable to pen cores of different lengths.

[0006] To solve the above technical problem, an embodiment of the present invention provides a light-sensing electronic touch pen, including a pen barrel, a pen core, a pen tip cap and a main bracket arranged inside the pen barrel. A friction sleeve for sleeving on the pen core is arranged inside the pen barrel. The inner wall of the friction sleeve is provided with bumps, and a pre-pressure spring for applying a pre-pressure to the friction sleeve is correspondingly arranged at the end of the friction sleeve. A lever rotating around a rotating shaft is arranged on the main bracket; one end of the lever is correspondingly provided with a light signal transceiver sensor, and the light signal transceiver sensor includes a light signal transmitting end and a light signal receiving end, and the light signal transmitting end and the light signal receiving end are correspondingly arranged on both sides of one end of the lever; the other end of the lever contacts the friction sleeve during writing.

[0007] Further, the pressure applied by the pre-pressure spring to the friction sleeve < the maximum static friction force between the pen core and the friction sleeve.

[0008] Further, a limiting platform for limiting is arranged on the main bracket at a preset distance corresponding to the front end of the friction sleeve.

[0009] Further, a pressure-bearing seat corresponding to the lever is provided on the main bracket. A pressure-bearing rod is inserted through the pressure-bearing seat, and a pressure-bearing spring is sleeved on the pressure-bearing rod. When writing, the pressure-bearing spring makes the top of the pressure-bearing rod abut against the lever, so that the lever is always in close contact with the friction sleeve during writing, preventing the lever from shaking and shifting.

[0010] Further, a limit buckle matching the pressure-bearing seat is convexly provided at the end of the pressure-bearing rod.

[0011] Further, the stylus calculates the deflection stroke of the lever according to the reduced light signal reception amount detected by the optical signal transceiver sensor, and then calculates the writing pressure; the calculation formula for the deflection stroke of the lever is as follows:

[0012] L = L 宽 * (Φ - Φ 测 ) / Φ;

[0013] Wherein, L is the deflection stroke of the lever, and L 宽 is the width of the light emitted by the optical signal transceiver sensor; Φ is the light signal reception amount detected by the optical signal transceiver sensor when the light emitted by the optical signal transceiver sensor is not blocked by the lever; Φ 测 is the light signal reception amount detected by the optical signal transceiver sensor during writing;

[0014] The writing pressure F = L * k, where k is a constant.

[0015] The beneficial effects of the present invention are as follows: The present invention uses a friction sleeve to transmit the writing pressure of the refill, and uses two optical signal transceiver sensors to detect and calculate the writing pressure, which can adapt to refills of different lengths, is convenient for users to replace, has a simple structure, is convenient for assembly, and has a low cost. Description of the Drawings

[0016] Figure 1 is the front view of the light-sensitive electronic stylus according to the embodiment of the present invention.

[0017] Figure 2 is Figure 1 the cross-sectional view taken along line A-A in

[0018] Figure 3 is Figure 2 the cross-sectional view taken along line C-C in

[0019] Figure 4 is the structural diagram of the light-sensitive electronic stylus according to the embodiment of the present invention when no refill is installed.

[0020] Figure 5 is Figure 4 the cross-sectional view taken along line B-B in

[0021] Figure 6 is the internal structural diagram of the light-sensitive electronic stylus according to the embodiment of the present invention.

[0022] Figure 7 It is a three-dimensional structure diagram of the friction sleeve according to an embodiment of the present invention.

[0023] Figure 8 It is a bottom view of the friction sleeve according to an embodiment of the present invention.

[0024] Figure 9 It is a three-dimensional structure diagram of the lever according to an embodiment of the present invention.

[0025] Explanation of the reference numerals in the drawings

[0026] Pen barrel 10, friction sleeve 11, bump 12, preloading spring 13, bearing seat 14, bearing spring 15, limit buckle 16, counterbore 17, bearing rod 18, pen refill 20, pen tip cap 30, main bracket 40, rotating shaft 41, lever 42, optical signal transceiver sensor 43, limit table 44. Detailed implementation manners

[0027] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0028] In the embodiments of the present invention, if there are directional indications (such as up, down, left, right, front, back...), they are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, in the present invention, the descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0030] Please refer to Figures 1 to 9 , the optical sensing electronic touch pen according to the embodiment of the present invention includes a pen barrel, a pen refill, a pen tip cap, and a main bracket disposed in the pen barrel.

[0031] Inside the pen shaft, there is a friction sleeve for sleeving on the pen core, and bump points are provided on the inner wall of the friction sleeve. The inner diameter of the friction sleeve is larger than the outer diameter of the pen core, and the inner diameter at the bump points is smaller than the outer diameter of the pen core. At the end of the friction sleeve, a preloading spring for applying a pre-pressure to the friction sleeve is correspondingly provided. On the main bracket, there is a lever that rotates around a rotating shaft and is used to amplify or reduce the movement stroke of the pen core. On both sides of one end of the lever, optical signal transceiver sensors are correspondingly provided, and the other end of the lever contacts the friction sleeve during writing. The optical signal transceiver sensors can adopt existing infrared optical signal transceiver sensors, including an optical signal transmitting end and an optical signal receiving end. When the lever deflects, it will block the light emitted by the optical signal transmitting end, affecting the amount of optical signal received by the receiving end. Inside the pen shaft, a main board is integrated, and there are components such as an MCU on the main board (this part is an existing structure), and the MCU is connected to the optical signal transceiver sensors.

[0032] As an implementation manner, the pressure applied by the preloading spring to the friction sleeve < the maximum static friction force between the pen core and the friction sleeve.

[0033] As an implementation manner, a limiting platform for limiting is provided on the main bracket at a preset distance corresponding to the front end of the friction sleeve.

[0034] As an implementation manner, a bearing seat corresponding to the lever is provided on the main bracket. A bearing rod is passed through the bearing seat, and a bearing spring is sleeved on the bearing rod. During writing, the bearing spring makes the top of the bearing rod abut against the lever, so that the lever is always in close contact with the friction sleeve during writing, preventing the lever from shaking and shifting. In specific implementation, a torsion spring can also be used to replace this part of the structure.

[0035] As an implementation manner, a limiting buckle matching the bearing seat is convexly provided at the end of the bearing rod.

[0036] As an implementation manner, the stylus calculates the deflection stroke of the lever according to the reduced amount of optical signal received by the optical signal transceiver sensors, and then calculates the writing pressure. When the lever deflects to this side, it will correspondingly block the light emitted by the optical signal transmitting end on this side. Therefore, the deflection stroke of the lever can be calculated according to the reduced amount of optical signal received by the optical signal receiving end on this side (when the received optical signal decreases, the voltage at both ends of the optical signal receiving end will change. By detecting this voltage change, the detection of the optical signal receiving amount can be realized. This part belongs to the existing technology).

[0037] The calculation formula for the deflection stroke of the lever is as follows:

[0038] L = L 宽 * (Φ - Φ 测 ) / Φ;

[0039] Among them, L is the deflection stroke of the lever, L 宽is the width of the light emitted by the optical signal transmitter; Φ is the amount of optical signal received detected by the optical signal receiver when the light emitted by the optical signal transmitter is not blocked by the lever; Φ 测 is the amount of optical signal received detected by the optical signal receiver during writing.

[0040] The writing pressure F = L * k, where k is a constant and can be measured through experiments.

[0041] The working principle of the present invention is as follows:

[0042] During assembly, first assemble the lever on the main bracket to form a rotating pair; then install the friction sleeve and the preloading spring. The preloading spring presses against the friction sleeve to make the friction sleeve (axially) close to the main bracket, and the lever contact point presses against the friction sleeve. When the lever rotates, it will affect the amount of optical signal received. Under the action of the preloading spring, the friction sleeve is close to the main bracket (axially), and the pressure-bearing rod closes the pressure-bearing spring in the pressure-bearing seat through the buckle position of the limit buckle. The pressure-bearing spring is in a free state and is not compressed. There is a small gap A between the pressure-bearing rod and the lever surface, and the gap between the pressure-bearing rod and the main bracket is B.

[0043] Press in the ballpoint pen refill. The friction sleeve is provided with bumps that are interference-fitted with the outer circumference of the pen refill. When the pen refill is inserted into the friction sleeve, the maximum static friction force between the pen refill and the friction sleeve is set as F1, the pressure of the friction sleeve on the lever is N, before the lever presses against the main bracket, the pressure of the pressure-bearing spring is F2, and it is set that F1 > N, N = F2 * (L2 / L1). When the pen refill is inserted into the friction sleeve, the displacement of the friction sleeve is S1 and the displacement of the pressure-bearing rod is S2, S2 = S1 * (L2 / L1), and the displacement of the pressure-bearing rod is amplified.

[0044] Therefore, during the process of inserting the pen refill, as the friction force between the pen refill and the friction sleeve becomes larger and larger, the lever presses against the main bracket until the pen refill is blocked by the front sink of the pen barrel (an existing structure).

[0045] Release the pen refill. The preloading spring bounces the friction sleeve up, the pressure-bearing spring bounces the pressure-bearing rod up, the lever is reset, there is no acting force between the lever and the pressure-bearing rod, and there is no acting force between the lever and the friction sleeve. During this process, there is no relative position change between the pen refill and the friction sleeve. There is no gap between the friction sleeve and the main bracket, and there is a gap between the pen refill and the front sink of the pen barrel.

[0046] Screw on the pen tip cap. There is a gap C between the pen tip cap and the pen refill to avoid reset error.

[0047] When writing on paper, the pen refill is stressed and will gradually retract. During this process, there is no relative position change between the friction sleeve and the pen refill.

[0048] The lever is rotating, and the amount of light blocked by the lever is also changing. This signal change will be processed by the MCU on the main board.

[0049] Increase the writing pressure until the step of the refill abuts against the counterbore at the front end of the pen barrel. At this time, the pressure-bearing rod also abuts against the main bracket. During this process, there is no relative position change between the friction sleeve and the refill.

[0050] Lift the pen without applying pressure to the pen tip, and the preloading spring resets the refill.

[0051] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A light-sensitive electronic stylus, comprising a pen barrel, a pen core, a pen tip cap and a main bracket disposed within the pen barrel, characterized in that, A friction sleeve for sleeving on a pen refill is provided inside the pen barrel. Convex points are provided on the inner wall of the friction sleeve. A preloading spring for applying a preloading force to the friction sleeve is correspondingly provided at the end of the friction sleeve. A lever that rotates around a rotating shaft is provided on the main bracket; one end of the lever is correspondingly provided with an optical signal transceiver sensor, and the optical signal transceiver sensor includes an optical signal transmitting end and an optical signal receiving end, and the optical signal transmitting end and the optical signal receiving end are correspondingly provided on both sides of one end of the lever; the other end of the lever contacts the friction sleeve during writing; The pressure applied by the preloading spring to the friction sleeve < the maximum static friction force between the pen refill and the friction sleeve; The stylus calculates the deflection stroke of the lever based on the reduced optical signal reception amount detected by the optical signal transceiver sensor, and then calculates the writing pressure; among them, the calculation formula for the deflection stroke of the lever is as follows: L = L 宽 * (Φ - Φ 测 ) / Φ; where L is the deflection stroke of the lever, and L 宽 is the width of the light emitted by the optical signal transceiver sensor; Φ is the amount of optical signal received detected by the optical signal transceiver sensor when the light emitted by the optical signal transceiver sensor is not blocked by the lever; Φ 测 is the amount of optical signal received detected by the optical signal transceiver sensor during writing; Writing pressure F = L * k, where k is a constant.

2. The optical sensor electronic touch pen according to claim 1, characterized in that, A limiting platform for limiting is provided on the main bracket at a preset distance corresponding to the front end of the friction sleeve.

3. The optical sensing electronic touch pen according to claim 1, characterized in that, A bearing seat corresponding to the lever is provided on the main bracket. A bearing rod is inserted through the bearing seat. A bearing spring is sleeved on the bearing rod. During writing, the bearing spring makes the top of the bearing rod abut against the lever, so that the lever always presses tightly against the friction sleeve during writing, preventing the lever from shaking and shifting.

4. The optical sensor electronic touch pen according to claim 3, characterized in that, A limiting buckle matching the bearing seat is convexly provided at the end of the bearing rod.

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