Calculator with handwriting board

Abstract

The utility model discloses a calculator with a handwriting board, which comprises a handwriting board unit, a calculator unit and a handwriting pen, the handwriting pen is detachably arranged on the calculator unit or the handwriting board unit, and the handwriting board unit is connected with the calculator unit. And in a storage state, the handwriting board unit and the calculator unit are overlapped up and down. In the unfolded state, the surface of the handwriting board unit and the calculator unit are horizontally arranged side by side. The handwriting board unit, the calculator unit and the handwriting pen are connected together, so that a user can directly obtain the information during use and does not need to find the information one by one. And the handwriting board unit and the calculator unit can be overlapped when not used, so that the overall size is reduced, and the portable computer is convenient to carry and store when going out. And the handwriting board unit and the calculator unit can be horizontally arranged side by side during use, and can be matched with a handwriting pen to record data or arithmetic on the handwriting board unit, so that the calculator can be used for calculation or verification subsequently, and the use of a user is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of calculator units, and particularly relates to a calculator with a writing board. Background Art

[0002] When practicing arithmetic ability, users usually calculate the required numerical values on a notepad and then verify them with a calculator. Also, when there are a large number of data to be calculated by users, they will pre-record the data simply for subsequent calculation by the calculator. In this state, users need to find paper, pen and calculator for operation, but these tools are scattered and need to be obtained one by one by users, which is rather cumbersome. Moreover, paper, pen and calculator are inconvenient for users to carry and store when they go out. Content of the Utility Model

[0003] The main purpose of the utility model is to provide a calculator with a writing board, which is used to solve the problems of cumbersome operation caused by the need to find paper, pen and calculator one by one during existing calculations and inconvenience for users to carry and store.

[0004] In order to solve the above technical problems, the technical solution provided by the utility model is as follows:

[0005] A calculator with a writing board includes a writing board unit, a calculator unit and a writing pen. The writing pen is detachably arranged on the calculator unit or the writing board unit, and the writing board unit is connected to the calculator unit;

[0006] In the storage state, the writing board unit and the calculator unit are arranged in an upper and lower overlapping manner;

[0007] In the unfolded state, the surface of the writing board unit is arranged horizontally side by side with the calculator unit.

[0008] As a preferred embodiment, the writing board unit is rotatably connected to the calculator unit;

[0009] At least one first rotating part is arranged on the writing board unit, and a second rotating part cooperating with the first rotating part is arranged on the calculator unit. The first rotating part and the second rotating part are connected by a shaft rod;

[0010] At least one first magnetic part is arranged in the calculator unit, and a second magnetic part used with the first magnetic part is arranged on the writing board unit. The first magnetic part is adsorbed to the second magnetic part when the writing board unit and the calculator unit are in the storage state;

[0011] A storage groove for storing the writing pen is formed on the calculator unit, and the writing pen is fixed by a buckle structure when placed in the storage groove.

[0012] As a preferred embodiment, the calculator with a writing tablet further includes a flexible connecting wire;

[0013] A first circuit board and a first clear switch electrically connected to the first circuit board are provided on the calculator unit, and a first liquid crystal display screen is provided on the writing tablet unit; a first wiring hole is provided on one side of the calculator unit close to the writing tablet unit, and a second wiring hole is provided on one side of the writing tablet unit close to the calculator unit; the flexible connecting wire passes through the first wiring hole and the second wiring hole, one end of the flexible connecting wire is placed inside the calculator unit and welded to the first circuit board, and the other end of the flexible connecting wire is placed inside the writing tablet unit and welded to the first liquid crystal display screen; when the first clear switch is operated, the first circuit board clears the content displayed on the first liquid crystal display screen through the flexible connecting wire;

[0014] A first locking switch electrically connected to the first circuit board is further provided on the calculator unit, and when the first circuit board receives the electrical signal fed back by the first locking switch, it locks the content displayed on the first liquid crystal display screen through the flexible connecting wire.

[0015] As a preferred embodiment, the first clear switch is a Hall switch, and a magnetic field magnet for generating a magnetic field is provided at the end of the writing pen; when the first circuit board receives the electrical signal fed back by the Hall switch, it clears the content displayed on the first liquid crystal display screen through the flexible connecting wire.

[0016] As a preferred embodiment, a first battery, a second circuit board, a first display, and a first button module are provided on the calculator unit, the first circuit board and the first display are both electrically connected to the second circuit board, and the first battery is electrically connected to the first circuit board; the first battery, the first circuit board, and the first display are all located above the second circuit board, and when the first button module is operated, the second circuit board calculates the input data;

[0017] A first photovoltaic panel is provided on the calculator unit, the first photovoltaic panel is electrically connected to the second circuit board, the first battery is a rechargeable battery, the first photovoltaic panel is used to convert light energy into electrical energy and transmit it to the second circuit board, and the second circuit board is used to process the electrical energy transmitted by the first photovoltaic panel and store it in the first battery through the first circuit board.

[0018] As a preferred embodiment, the first battery is a button battery, a first conductive sheet in an arched shape is provided on the first circuit board, a first pull-out member is detachably provided on the calculator unit, a first placement groove is provided on the first pull-out member, and the first battery is arranged in the first placement groove; when a part of the first pull-out member is placed inside the calculator unit, one surface of the first battery abuts against the pad on the first circuit board, and the other surface of the first battery abuts against the first conductive sheet;

[0019] The first drawer is fixed to the calculator unit at one end of the first placement groove by screws. At the other end of the first placement groove, the first drawer is provided with a first elastic member, and a first clamping block is arranged on the first elastic member. The calculator unit is provided with a first clamping groove at a position corresponding to the first clamping block. When the first drawer is installed on the calculator unit, the first clamping block is placed in the first clamping groove.

[0020] As a preferred embodiment, the handwriting board unit and the calculator unit are connected by a magnetic attraction method;

[0021] A plurality of third magnetic attraction members are arranged on the handwriting board unit, and at least part of the third magnetic attraction members are arranged close to the periphery of the handwriting board unit; the calculator unit is provided with a fourth magnetic attraction member that adsorbs to the third magnetic attraction member;

[0022] The third magnetic attraction member is a magnet or an iron block, and the fourth magnetic attraction member is a magnet; alternatively, the third magnetic attraction member is a magnet, and the fourth magnetic attraction member is an iron block;

[0023] Both the third magnetic attraction member and the fourth magnetic attraction member are strip-shaped. The three third magnetic attraction members are all arranged along the length direction of the calculator unit, and one third magnetic attraction member is arranged along the width direction of the calculator unit.

[0024] As a preferred embodiment, the handwriting board unit and the calculator unit are slidably connected;

[0025] A chute for accommodating the calculator unit is formed on the back surface of the handwriting board unit; in the storage state, the calculator unit is placed in the chute;

[0026] Limiting convex strips are arranged on the side wall of the chute, and a second clamping groove is formed on the limiting convex strip; a limiting groove that cooperates with the limiting convex strip is formed on the side wall of the calculator unit, and the limiting groove is located at a position close to the end of the calculator unit. A second clamping block that cooperates with the second clamping groove is arranged on the limiting groove; in the storage state, the limiting convex strip is placed in the limiting groove, and the second clamping block is placed in the second clamping groove;

[0027] A support convex block is formed by protruding outward on the side of the handwriting board unit away from the chute.

[0028] As a preferred embodiment, when the handwriting board unit and the calculator unit are connected by one of a rotation method, a magnetic attraction method, a snap connection method, and a sliding method;

[0029] The handwriting tablet unit includes a first housing, a second battery, a third circuit board, and a second liquid crystal display screen. The third circuit board, the second battery, and the second liquid crystal display screen are all disposed within the first housing. The second liquid crystal display screen and the second battery are both electrically connected to the third circuit board. The third circuit board is located above or below the second liquid crystal display screen. A first display opening is provided on the surface of the first housing at a position corresponding to the second liquid crystal display screen;

[0030] A second clear switch is provided on the third circuit board. A first pressing member is provided on the first housing at a position corresponding to the second clear switch. The first pressing member is connected to the second clear switch. When the third circuit board detects an electrical signal fed back by the second clear switch, it controls the second liquid crystal display screen to clear the displayed content;

[0031] A second locking switch is provided on the first circuit board. A first operating member is provided on the first housing at a position corresponding to the second locking switch. The first operating member is connected to the second locking switch. When the third circuit board detects an electrical signal fed back by the second locking switch, it locks the content displayed on the second liquid crystal display screen;

[0032] The second locking switch is a DIP switch. The first pressing member is located on the surface of the first housing having the first display opening. The second locking switch is located on the top of the first housing.

[0033] As a preferred embodiment, the handwriting tablet unit and the calculator unit are connected by a snap connection;

[0034] A connecting block is provided on one side wall of the handwriting tablet unit. A fourth card slot for cooperating with the connecting block is provided on one side wall of the calculator unit. The connecting block is placed in the fourth card slot when the handwriting tablet unit and the calculator unit are connected;

[0035] A fifth magnetic member is provided within the handwriting tablet unit. A sixth magnetic member is provided within the calculator unit. The fifth magnetic member adsorbs to the sixth magnetic member when the handwriting tablet unit and the calculator unit are stored;

[0036] The utility model has the following beneficial effects: Compared with the prior art, the utility model connects the handwriting tablet unit, the calculator unit, and the handwriting pen together so that the user can directly obtain them during use without searching for them one by one. When the handwriting tablet unit and the calculator unit are not in use, they can be stacked to reduce the overall volume for easy carrying and storage when going out. When the handwriting tablet unit and the calculator unit are in use, they can be arranged horizontally side by side. Together with the handwriting pen, data can be recorded or arithmetic operations can be performed on the handwriting tablet unit, and then calculations or verifications can be carried out using the calculator, which is convenient for the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0038] Figure 1 It is an unfolded state diagram of the rotational connection between the handwriting board unit and the calculator unit of the present invention;

[0039] Figure 2 It is a folded state diagram of the rotational connection between the handwriting board unit and the calculator unit of the present invention;

[0040] Figure 3 It is an exploded view of the rotational connection between the handwriting board unit and the calculator unit of the present invention;

[0041] Figure 4 It is a schematic diagram of the handwriting board unit in the rotational connection between the handwriting board unit and the calculator unit of the present invention;

[0042] Figure 5 For Figure 4 An enlarged view of area B in

[0043] Figure 6 It is a schematic diagram of the calculator unit in the rotational connection between the handwriting board unit and the calculator unit of the present invention;

[0044] Figure 7 For Figure 6 An enlarged view of area C in

[0045] Figure 8 It is an exploded view of the calculator unit in the rotational connection between the handwriting board unit and the calculator unit of the present invention;

[0046] Figure 9 It is a partial internal structure diagram of the calculator unit in the rotational connection between the handwriting board unit and the calculator unit of the present invention;

[0047] Figure 10 For Figure 9 An enlarged view of area A in

[0048] Figure 11 It is an assembly diagram of the first pulling member and the first circuit board in the rotational connection between the handwriting board unit and the calculator unit of the present invention;

[0049] Figure 12 It is an exploded view of the handwriting board unit in the rotational connection between the handwriting board unit and the calculator unit of the present invention;

[0050] Figure 13This is a folded state diagram of the magnetic connection between the handwriting board unit and the calculator unit of the present utility model;

[0051] Figure 14 This is an unfolded state diagram of the magnetic connection between the handwriting board unit and the calculator unit of the present utility model;

[0052] Figure 15 This is an exploded view of the calculator unit in the magnetic connection between the handwriting board unit and the calculator unit of the present utility model;

[0053] Figure 16 This is a structural diagram of the third surface shell on the calculator unit in the magnetic connection between the handwriting board unit and the calculator unit of the present utility model;

[0054] Figure 17 This is an exploded view of the handwriting board unit in the magnetic connection between the handwriting board unit and the calculator unit of the present utility model;

[0055] Figure 18 This is an assembly diagram of the third circuit board and the second drawer part in the magnetic connection between the handwriting board unit and the calculator unit of the present utility model;

[0056] Figure 19 This is a schematic diagram of the handwriting board unit located on the back of the calculator unit in the sliding connection between the handwriting board unit and the calculator unit of the present utility model;

[0057] Figure 20 This is a schematic diagram of the handwriting board unit located in front of the calculator unit in the sliding connection between the handwriting board unit and the calculator unit of the present utility model;

[0058] Figure 21 This is an exploded view of the handwriting board unit and the calculator unit in the sliding connection between the handwriting board unit and the calculator unit of the present utility model;

[0059] Figure 22 For Figure 21 The enlarged view of area D in

[0060] Figure 23 This is an unfolded schematic diagram of the snap connection between the handwriting board unit and the calculator unit of the present utility model;

[0061] Figure 24 This is an exploded view of the handwriting board unit and the calculator unit in the snap connection between the handwriting board unit and the calculator unit of the present utility model;

[0062] Figure 25 This is a schematic diagram of the connection block placed in the fourth card slot in the snap connection between the handwriting board unit and the calculator unit of the present utility model;

[0063] Figure 26 This is a principle block diagram of the electrical connection of the first battery, power supply circuit, boost module, and first liquid crystal screen of the present utility model.

[0064] Figure 27 This is the circuit diagram of the power supply circuit of the present utility model;

[0065] Figure 28 This is the circuit diagram of the boost module of the present utility model. Specific embodiments

[0066] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0067] Referring to the attached Figure 1 - 28 , a calculator with a writing board in the embodiments of the present utility model.

[0068] The calculator with a writing board includes a writing board unit 200, a calculator unit 100, and a writing pen 300. The writing pen 300 is detachably arranged on the calculator unit 100 or the writing board unit 200, and the writing board unit 200 is connected to the calculator unit 100. In the storage state, the writing board unit 200 and the calculator unit 100 are arranged in an upper and lower overlapping manner. In the unfolded state, the surface of the writing board unit 200 is horizontally arranged side by side with the calculator unit 100.

[0069] In this embodiment, the writing board unit 200, the calculator unit 100, and the writing pen 300 are connected together so that the user can directly obtain them during use without searching for them one by one. Moreover, when the writing board unit 200 and the calculator unit 100 are not in use, they can be overlapped and placed to reduce the overall volume for easy carrying and storage when going out. And when the writing board unit 200 and the calculator unit 100 are in use, they can be horizontally arranged side by side, and together with the writing pen 300, data or arithmetic can be recorded on the writing board unit 200 for subsequent calculation or verification using the calculator, which is convenient for the user to use.

[0070] Among them, in actual application, the writing board unit 200 is rotatably connected to the calculator unit 100.

[0071] Referring to the attached Figure 1 - 12, Specifically, at least one first rotating part 223 is provided on the handwriting board unit 200, and a second rotating part 146 that cooperates with the first rotating part 223 is provided on the calculator unit 100. The first rotating part 223 and the second rotating part 146 are connected by a shaft rod 20 to realize the rotational connection between the handwriting board unit 200 and the calculator unit 100, so that when not in use, the handwriting board unit 200 and the calculator unit 100 can be folded and placed, and can be unfolded when in use for the user to use. Of course, in other embodiments, the handwriting board unit 200 and the calculator unit 100 can be connected by a hinge, and the rotational connection between the handwriting board unit 200 and the calculator unit 100 can also be realized.

[0072] In a preferred embodiment, at least one first magnetic part 150 is provided inside the calculator unit 100, and a second magnetic part 230 that is used with the first magnetic part 150 is provided on the handwriting board unit 200. The first magnetic part 150 adsorbs to the second magnetic part 230 when the handwriting board unit 200 and the calculator unit 100 are in the storage state, so as to fix the positions when the handwriting board unit 200 and the calculator unit 100 are folded and placed, prevent the handwriting board unit 200 and the calculator unit 100 from opening, and facilitate storage and carrying. Moreover, during the carrying process, other items can be prevented from knocking on the display unit on the handwriting board unit 200, playing a protective role. Among them, one of the first magnetic part 150 and the second magnetic part 230 is a magnet, and the other is an iron block; or both the first magnetic part 150 and the second magnetic part 230 are magnets.

[0073] Refer to the appendix Figure 13 - 18 , In actual use, the handwriting board unit 200 and the calculator unit 100 can also be connected by a magnetic attraction method, and can also be folded and placed when not in use and unfolded when in use.

[0074] Specifically, a plurality of third magnetic parts 530 are provided on the handwriting board unit 200, and at least part of the third magnetic parts 530 are arranged close to the periphery of the handwriting board unit 200. A fourth magnetic part 460 that adsorbs to the third magnetic part 530 is provided on the calculator unit 100. In this way, when the handwriting board unit 200 and the calculator unit 100 are unfolded and arranged side by side horizontally, the third magnetic part 530 and the fourth magnetic part 460 adsorb and fix. When the handwriting board unit 200 and the calculator unit 100 are stored and folded, the third magnetic part 530 and the fourth magnetic part 460 can also be used to adsorb to fix the relative positions of the handwriting board unit 200 and the calculator unit 100 to prevent them from opening. Among them, the third magnetic part 530 is a magnet or an iron block, and the fourth magnetic part 460 is a magnet. Or the third magnetic part 530 is a magnet, and the fourth magnetic part 460 is an iron block.

[0075] In a preferred embodiment, the number of the third magnetic members 530 and the fourth magnetic members 460 is four each. The four third magnetic members 530 are respectively arranged near the four corner ends of the handwriting board unit 200. Both the third magnetic members 530 and the fourth magnetic members 460 are strip-shaped, so as to increase the adsorption force between the third magnetic members 530 and the fourth magnetic members 460.

[0076] In this embodiment, three of the third magnetic members 530 are arranged along the length direction of the calculator unit 100, and one third magnetic member 530 is arranged along the width direction of the calculator unit 100. Of course, in other embodiments, all four third magnetic members 530 can be arranged along the length or width direction of the calculator unit 100, etc.

[0077] Refer to the appendix Figure 19 - 22 , in actual use, the handwriting board unit 200 and the calculator unit 100 can also be slidably connected, and it can also be realized that when not in use, the handwriting board unit 200 and the calculator unit 100 can be folded and placed, and can be unfolded when in use.

[0078] Specifically, a chute 610 for accommodating the calculator unit 100 is formed on the back surface of the handwriting board unit 200. In the storage state, the calculator unit 100 is placed in the chute 610, that is, the calculator unit 100 and the handwriting board unit 200 are slidably arranged. That is, the handwriting board unit 200 can act as a sliding cover. When the calculator unit 100 is in use, the sliding cover is placed on the back surface of the calculator unit 100. When the calculator unit 100 is not in use, the sliding cover acts as a protective cover and is placed in front of the calculator unit 100 to protect the calculator unit 100.

[0079] In a preferred embodiment, a limiting rib 630 is arranged on the side wall of the chute 610, and a second clamping groove 620 is formed on the limiting rib 630. A limiting groove 650 for cooperating with the limiting rib 630 is formed on the side wall of the calculator unit 100. The limiting groove 650 is located at a position near the end of the calculator unit 100, and a second clamping block 640 for cooperating with the second clamping groove 620 is arranged on the limiting groove 650. In the storage state, the limiting rib 630 is placed in the limiting groove 650, and the second clamping block 640 is placed in the second clamping groove 620 to fix the relative positions of the calculator unit 100 and the handwriting board unit 200. When the user needs to use the handwriting board unit 200 and the calculator unit 100 simultaneously, the calculator unit 100 can be pulled out to be separated from the handwriting board unit 200, so that the handwriting board unit 200 and the calculator unit 100 can be arranged horizontally side by side.

[0080] In a preferred embodiment, a support bump 660 is formed by protruding outward on one side of the handwriting tablet unit 200 away from the chute 610. Thus, when the sliding cover is placed on the back of the calculator unit 100, the entire product can be supported by the support bump 660, preventing the surface of the handwriting tablet unit 200 from directly contacting the placement surface and scratching the surface of the handwriting tablet unit 200, playing a protective role.

[0081] Refer to the attached Figure 23 - 25 , in actual use, the handwriting tablet unit 200 and the calculator unit 100 can also be connected in a snap - fit form, and it is also possible to fold and place the handwriting tablet unit 200 and the calculator unit 100 when not in use and unfold them when in use.

[0082] Specifically, a connection block 720 is provided on one side wall of the handwriting tablet unit 200, and a fourth slot 710 for cooperating with the connection block 720 is opened on one side wall of the calculator unit 100. The connection block 720 is placed in the fourth slot 710 when the handwriting tablet unit 200 and the calculator unit 100 are connected. A fifth magnetic member 740 is provided inside the handwriting tablet unit 200, and a sixth magnetic member 730 is provided inside the calculator unit 100. The fifth magnetic member 740 adsorbs to the sixth magnetic member 730 when the handwriting tablet unit 200 and the calculator unit are stored.

[0083] That is, when the handwriting tablet unit 200 and the calculator unit 100 are in use, the connection block 720 is placed in the fourth slot 710 to achieve the connection between the two, and they are arranged horizontally side by side. And when the handwriting tablet unit 200 and the calculator unit 100 are stored, the fifth magnetic member 740 and the sixth magnetic member 730 are adsorbed to achieve fixation during folding.

[0084] Among them, one of the fifth magnetic member 740 and the sixth magnetic member 730 is a magnet and the other is an iron block; or both the fifth magnetic member 740 and the sixth magnetic member 730 are magnets. Of course, in other embodiments, the connection block 720 can also be provided on the side wall of the calculator unit 100, and the fourth slot 710 is opened on the handwriting tablet unit 200, etc.

[0085] In one embodiment, the number of connection blocks 720 is four, and two connection blocks 720 are respectively arranged on two opposite side walls of the handwriting tablet unit 200. Correspondingly, the number of fourth slots 710 is also 4, and each fourth slot 710 is arranged corresponding to the position of a connection block 720 to adapt to the usage habit of left - handed writing.

[0086] In the above embodiments, when the handwriting tablet unit 200 is connected to the calculator unit 100 by means of rotation, magnetic attraction, snap connection, sliding, etc., a power supply can be configured only on the calculator unit 100, and the calculator unit 100 is electrically connected to the handwriting tablet unit 200 to supply power to the handwriting tablet unit 200; alternatively, power supplies can be separately configured inside both the handwriting tablet unit 200 and the calculator unit 100.

[0087] Refer to the attached Figure 1 - 12 , in the embodiment where a power supply is configured on the calculator unit 100 and no power supply is configured on the handwriting tablet unit 200, the calculator with a handwriting tablet further includes a flexible connection line 10.

[0088] A first circuit board 170 and a first clear switch 173 electrically connected to the first circuit board 170 are provided on the calculator unit 100, and a first liquid crystal display screen 210 is provided on the handwriting tablet unit 200. The calculator unit 100 is provided with a first wire passing hole 30 on the side close to the handwriting tablet unit 200, and the handwriting tablet unit 200 is provided with a second wire passing hole 40 on the side close to the calculator unit 100. The flexible connection line 10 passes through the first wire passing hole 30 and the second wire passing hole 40. One end of the flexible connection line 10 is placed inside the calculator unit 100 and welded to the first circuit board 170, and the other end of the flexible connection line 10 is placed inside the handwriting tablet unit 200 and welded to the first liquid crystal display screen 210. In this way, the handwriting tablet unit 200 and the calculator unit 100 are electrically connected together. When the first clear switch 173 is operated, an electrical signal is fed back to the first circuit board 170, and the first circuit board 170 clears the content displayed on the first liquid crystal display screen 210 through the flexible connection line 10.

[0089] A first battery 180, a second circuit board 160, a first display 120, and a first key module 130 are provided on the calculator unit 100. The first circuit board 170 and the first display 120 are both electrically connected to the second circuit board 160. The first battery 180 is electrically connected to the first circuit board 170 to supply power to the first circuit board 170, and through the first circuit board 170, power is supplied to the second circuit board 160, and also through the first circuit board 170 and the flexible connection line 10, power is supplied to the first liquid crystal display screen 210. The first battery 180, the first circuit board 170, and the first display 120 are all located above the second circuit board 160 for reasonable layout and can effectively reduce the volume of the calculator unit 100. When the first key module 130 is operated, the second circuit board 160 calculates the input data to realize the functions of the calculator unit 100, facilitating user operation and calculation.

[0090] In one embodiment, a first locking switch 171 electrically connected to the first circuit board 170 is further provided on the calculator unit 100. When the first circuit board 170 receives the electrical signal fed back by the first locking switch 171, it locks the content displayed on the first liquid crystal screen 210 through the flexible connection line 10, so as to prevent the user from accidentally operating the first clear switch 173 and clearing the content on the first liquid crystal screen 210.

[0091] In one embodiment, the side walls of the first wiring hole 30 and / or the second wiring hole 40 in the length direction are smooth arc surfaces. Thus, when the handwriting board unit 200 rotates relative to the calculator unit 100, the friction and creases on the flexible connection line 10 can be effectively reduced, and the service life of the flexible connection line 10 can be improved.

[0092] In one embodiment, the sum of the distance between the bottom surface of the first circuit board 170 and the first wiring hole 30, the width of the first wiring hole 30, the distance between the first wiring hole 30 and the second wiring hole 40, the width of the second wiring hole 40, and the distance between the second wiring hole 40 and the first liquid crystal screen 210 is the first length. After removing the parts of the flexible connection line 10 welded to the first circuit board 170 and the first liquid crystal screen 210, the remaining length is greater than the first length. Thus, when the handwriting board unit 200 rotates relative to the calculator unit 100 and the flexible connection line 10 is folded, it will not be folded along the position of a single line, but will have an area for folding. Thereby, the service life of the flexible connection line 10 can be further improved. Specifically, after removing the parts of the flexible connection line 10 welded to the first circuit board 170 and the first liquid crystal screen 210, the remaining length is greater than the first length by 1 mm.

[0093] In one embodiment, the first clear switch 173 is a Hall switch, and a magnetic field magnet 320 for generating a magnetic field is provided at the end of the handwriting pen 300. When the first circuit board 170 receives the electrical signal fed back by the Hall switch, it clears the content displayed on the first liquid crystal screen 210 through the flexible connection line 10. Thus, when the user needs to clear the content on the first liquid crystal screen 210, the end of the handwriting pen 300 can be brought close to the Hall switch.

[0094] In one embodiment, a first photovoltaic panel 110 is provided on the calculator unit 100. The first photovoltaic panel 110 is electrically connected to the second circuit board 160. The first battery 180 is a rechargeable battery. The first photovoltaic panel 110 is used to convert light energy into electrical energy and transmit it to the second circuit board 160. The second circuit board 160 is used to process the electrical energy transmitted by the first photovoltaic panel 110 and store it in the first battery 180 through the first circuit board 170. Thereby, resources can be saved.

[0095] Specifically, the first photovoltaic panel 110 may be located between the first display 120 and the first button module 130, or the first photovoltaic panel 110 may also be located on the side of the first display 120 away from the first button module 130.

[0096] Refer to the appendix Figure 26 - 28 In an embodiment, a power supply circuit 80 and a boost module 50 are integrated on the first circuit board 170. The power supply circuit 80 is electrically connected to the second circuit board 160, the first battery 180, and the boost module 50 respectively. The power supply circuit 80 can be used to connect to an external power supply to charge the first battery 180. The power supply circuit 80 can also be used to manage the charging and discharging of the first battery 180. The power supply circuit 80 is also electrically connected to the first photovoltaic panel 110, and the electric energy converted from light energy by the first photovoltaic panel 110 is processed and then stored in the first battery 180. The boost module 50 is electrically connected to the first clear switch 173 and the first liquid crystal screen 210 respectively. In this way, when the boost module 50 detects the electrical signal fed back by the first clear switch 173, the boost module 50 boosts the voltage output by the power supply circuit 80 and transmits the boosted voltage to the first liquid crystal screen 210 to clear the content on the first liquid crystal screen 210.

[0097] Specifically, the boost module 50 includes a boost chip U1, a first inductor L1, a first diode D1, a first triode Q1, a first resistor R1, a first capacitor C5, a second resistor R2, a third resistor R3, a second triode Q2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a ninth resistor R9, a third triode Q3, a fourth triode Q4, a seventh resistor R7, a fifth triode Q5, an eighth resistor R8, and a connection interface WLCD.

[0098] The model of the boost chip U1 can be SAP02. The first pin of the boost chip U1 is connected to the collector of the first triode Q1 via the first inductor L1. The collector of the first triode Q1 is connected to the first capacitor C5, the second resistor R2, the first pin of the second triode Q2, the third pin of the third triode Q3, and the fourth resistor R4 respectively after passing through the first diode D1. The second pin of the boost chip U1 is connected to the connection point of the sixth resistor R6 and the ninth resistor R9. The fifth pin of the boost chip U1 is connected to the base of the first triode Q1 via the first resistor R1. The sixth pin of the boost chip U1 is connected to the base of the fourth triode Q4 via the seventh resistor R7. The seventh pin of the boost chip U1 is connected to the base of the fifth triode Q5 via the eighth resistor R8. The emitter of the first triode Q1 and one end of the first capacitor C5 are grounded. The two ends of the second resistor R2 are respectively connected to the base and the collector of the second triode Q2. The two ends of the third resistor R3 are respectively connected to the base and the collector of the second triode Q2. The two ends of the fourth resistor R4 are respectively connected to the base and the emitter of the third triode Q3. The two ends of the fifth resistor R5 are respectively connected to the base and the collector of the third triode Q3 and the fourth triode Q4. The collector of the second triode Q2 is electrically connected to the collector of the fourth triode Q4. The emitters of the fourth triode Q4 and the fifth triode Q5 are both grounded. Among them, the first triode Q1, the fourth triode Q4, and the fifth triode Q5 are all NPN-type triodes, and the second triode Q2 and the third triode Q3 are PNP-type triodes.

[0099] When the first clear switch 173 is a Hall switch, the first pin of the boost chip U1 is also connected to the power supply circuit 80 and the first pin of the Hall switch, and the third pin of the Hall switch is connected to the third pin of the boost chip U1. When the first clear switch 173 is a push-button switch, one end of the push-button switch is connected to the third pin of the boost chip U1, and the other end of the push-button switch is grounded.

[0100] The connection interface WLCD is used to connect to the first liquid crystal screen 210. The first pin on the connection interface WLCD is connected to the collector of the third triode Q3 after passing through the sixth resistor R6 and the ninth resistor R9 in sequence. The second pin on the connection interface WLCD is connected to the collector of the fourth triode Q4.

[0101] When the push-button switch is closed, the voltage on the third pin of the boost chip U1 is pulled low; or, when the boost chip U1 detects the voltage fed back by the Hall switch, the boost chip U1 outputs a voltage with a certain frequency to the first triode Q1 via the first resistor R1, realizes voltage boost by using the loop of the first inductor L1, and then through the loops of the second triode Q2 and the fourth triode Q4, outputs the boosted voltage to the first liquid crystal screen 210 via the connection interface WLCD, so as to clear the content on the first liquid crystal screen 210.

[0102] Referring to the attached Figure 1 - 12 , in one embodiment, the first battery 180 is a button battery. An arched first conductive sheet 172 is provided on the first circuit board 170. A first drawer member 143 is detachably provided on the calculator unit 100. A first placement groove 1434 is formed in the first drawer member 143. The first battery 180 is disposed in the first placement groove 1434. When a part of the first drawer member 143 is placed inside the calculator unit 100, one surface of the first battery 180 abuts against the pad on the first circuit board 170, and the other surface of the first battery 180 abuts against the first conductive sheet 172. When the first battery 180 runs out of power, the user can detach the first drawer member 143 from the calculator unit 100, replace the first battery 180 and then reinstall it, so as to extend the service life of the product in this embodiment.

[0103] Specifically, one end of the first drawer member 143 in the first placement groove 1434 is fixed to the calculator unit 100 by a screw. A first elastic member 1431 is provided at the other end of the first drawer member 143 in the first placement groove 1434. A first locking block 1433 is provided on the first elastic member 1431. A first locking groove 1432 is formed in the calculator unit 100 at a position corresponding to the first locking block 1433. The first locking block 1433 is placed in the first locking groove 1432 when the first drawer member 143 is installed on the calculator unit 100. That is, one side of the first drawer member 143 is fixed to the calculator unit 100 in a snap-fit manner, and the other side is fixed by a screw, so as to stably fix the first drawer member 143 to the calculator unit 100. When the first drawer member 143 needs to be detached, the screw can be unscrewed, and then the first drawer member 143 can be pulled forcefully to detach the first drawer member 143 from the calculator unit 100.

[0104] In one embodiment, to facilitate the disassembly and assembly of the first drawer member 143, the sides of the first locking block 1433 and the first locking groove 1432 are inclined surfaces, so that the first locking block 1433 can be placed in the first locking groove 1432 and can be easily detached from the first locking groove 1432.

[0105] In the above embodiment, the calculator unit 100 includes a third housing 140. The third housing 140 includes a third front shell 142 and a third bottom shell 141. The third front shell 142 and the third bottom shell 141 can be connected by means of snap fasteners or screws. The third front shell 142 and the third bottom shell 141 are connected to form a first wire routing hole 30. The second rotating part 146 is integrally injection-molded with the third front shell 142. The first button module 130 is arranged on the third front shell 142. The first locking switch 171 is arranged on the first circuit board 170. The first clear switch 173 is arranged on the second circuit board 160, and the second circuit board 160 is electrically connected to the first circuit board 170 to realize the electrical connection between the first clear switch 173 and the first circuit board 170. The first circuit board 170 is located behind the first display 120. The first display 120 is arranged on the third front shell 142. The first pull-out member 143 is locked to the third front shell 142 by screws. The first battery 180 is located on one side of the first circuit board 170 close to the third front shell 142. A first switch button is arranged on the first circuit board 170. By operating the first button module 130, the calculator unit 100 can be turned on for calculating numerical values. The third front shell 142 is provided with a through hole 149 at a position corresponding to the Hall switch, so that the Hall switch can detect the magnetic field generated by the magnetic field magnet 320.

[0106] The handwriting tablet unit 200 includes a fourth housing 220. The fourth housing 220 includes a fourth front shell 222 and a fourth bottom shell 221. The fourth front shell 222 and the fourth bottom shell 221 can be connected by means of snap fasteners or screws. The fourth front shell 222 and the fourth bottom shell 221 are connected to form a second wire routing hole 40. The first rotating part 223 is integrally injection-molded with the fourth front shell 222.

[0107] The third front shell 142 is recessed to form a first avoidance groove 148 at a position corresponding to the first rotating part 223. The fourth front shell 222 is recessed to form a second avoidance groove 60 at a position corresponding to the second rotating part 146. When the first rotating part 223 is connected to the second rotating part 146, at least part of the second rotating part 146 is placed in the second avoidance groove 60, and at least part of the first rotating part 223 is placed in the first avoidance groove 148, so as to reduce the thickness of the calculator unit 100 and the handwriting tablet unit 200 in the storage state.

[0108] In the above embodiment, only the first battery 180 is configured in the calculator unit, and the flexible connection line 10 is used to control the handwriting tablet unit 200 and supply power to the handwriting tablet unit 200. Moreover, the handwriting tablet unit 200 is not configured with a battery, a circuit board, a clear switch, and a locking switch, which can maximize the volume of the first liquid crystal screen 210, increase the handwriting area, and improve the use experience of the handwriting tablet unit 200.

[0109] In one implementation, the fourth cover 222 is provided with a second display opening 224 at a position corresponding to the first liquid crystal screen 210, so that the user can write on the first liquid crystal screen 210. The height of the side wall of the second display opening 224 is equal to or greater than the height of the first button module 130 protruding from the outside of the third cover 142, so that when the calculator unit 100 and the handwriting tablet unit 200 are folded and stored, the first button module 130 protruding from the outside of the third cover 142 can be placed on the side wall formed by the second display opening 224, so that the first magnetic member 150 and the second magnetic member 230 are attracted to each other, and the surfaces of the calculator unit 100 and the handwriting tablet unit 200 are attached to each other.

[0110] In one embodiment, a storage slot 147 for storing the stylus pen 300 is provided on the third housing 140, and the stylus pen 300 is fixed by a buckle structure when placed in the storage slot 147. Specifically, a friction bump 310 is provided on the top of the stylus pen 300, and a window 311 is provided on the third housing 140 at a position corresponding to the friction bump 310. The user can remove the stylus pen 300 from the storage slot 147 by moving the friction bump 310 for easy use by the user.

[0111] When the handwriting tablet unit 200 and the calculator unit 100 are connected by magnetic attraction, the fourth face shell 222 and the fourth bottom shell 221 are connected to form a first mounting groove 70, and the third magnetic member 530 is arranged in the first mounting groove 70 to fix the third magnetic member 530. The third face shell 142 and the third bottom shell 141 are connected to form a second mounting groove 443, and the fourth magnetic member 460 is arranged in the second mounting groove 443 to fix the fourth magnetic member 460. In other embodiments, the third magnetic member 530 can also be directly injected together when the fourth face shell 222 or the fourth bottom shell 221 is injected, and the fourth magnetic member 460 can also be injected together when the third face shell 142 or the third bottom shell 141 is injected; or, the third magnetic member 530 can also be fixed to the fourth housing 220 by snapping or gluing, and the fourth magnetic member 460 can also be fixed to the third housing 140 by snapping or gluing.

[0112] Refer to the attached Figure 15 - 18, when power supplies are separately configured inside the graphics tablet unit 200 and the calculator unit 100, the graphics tablet unit 200 includes a first housing 520, a second battery 540, a third circuit board 560, and a second liquid crystal display screen 510. The third circuit board 560, the second battery 540, and the second liquid crystal display screen 510 are all disposed inside the first housing 520. The second liquid crystal display screen 510 and the second battery 540 are both electrically connected to the third circuit board 560. The third circuit board 560 is located above or below the second liquid crystal display screen 510. A first display opening 523 is formed in the surface of the first housing 520 at a position corresponding to the second liquid crystal display screen 510. The second battery 540 can be used to supply power to the third circuit board 560 and the second liquid crystal display screen 510. A second clear switch 562 is provided on the third circuit board 560. A first pressing member 524 is provided on the first housing 520 at a position corresponding to the second clear switch 562. The first pressing member 524 is connected to the second clear switch 562. When the third circuit board 560 detects an electrical signal fed back by the second clear switch 562, it controls the second liquid crystal display screen 510 to clear the displayed content. Thus, when the user needs to clear the content on the second liquid crystal display screen 510, the first pressing member 524 can be operated and pressed.

[0113] In one embodiment, a second locking switch 561 is provided on the third circuit board 560. A first operating member 525 is provided on the first housing 520 at a position corresponding to the second locking switch 561. The first operating member 525 is connected to the second locking switch 561. When the third circuit board 560 detects an electrical signal fed back by the second locking switch 561, it locks the content displayed on the second liquid crystal display screen 510. Thus, when the user needs to lock the content on the second liquid crystal display screen 510 from being accidentally cleared, the first operating member 525 can be operated and pressed.

[0114] Specifically, the second locking switch 561 is a DIP switch. The first pressing member 524 is located on the surface of the first housing 520 having the first display opening 523. The second locking switch 561 is located on the top of the first housing 520.

[0115] In one embodiment, a second pulling member 550 is detachably provided on the top of the first housing 520. A second placement groove 551 is provided on the second pulling member 550. An arched second conductive sheet 563 is provided on the third circuit board 560. The second battery 540 is a button battery and is installed on the second placement groove 551. When the second pulling member 550 is assembled to the first housing 520, the second placement groove 551 is placed inside the first housing 520 and is located below the second conductive sheet 563. One surface of the second battery 540 abuts against the second conductive sheet 563, and the other surface of the second battery 540 abuts against a pad on the third circuit board 560. So that when the second battery 540 runs out of power, the user can detach the second pulling member 550 from the first housing 520, replace the second battery 540 and then reinstall it to improve the service life of the product in this embodiment.

[0116] Specifically, one end of the second drawer member 550 is fixed to the first housing 520 by screws. The second drawer member 550 is provided with a third locking block 552 on the side wall corresponding to the second placement groove 551. The first housing 520 is provided with a third locking groove 554 at the position corresponding to the third locking block 552. When the second drawer member 550 is installed on the first housing 520, the third locking block 552 is placed in the third locking groove 554. That is, one side of the second drawer member 550 is fixed to the first housing 520 in the form of a buckle, and the other side is fixed by screws, so as to stably fix the second drawer member 550 on the first housing 520. Among them, when the second drawer member 550 needs to be disassembled, the screws can be unscrewed, and then the second drawer member 550 can be pulled forcefully to remove the second drawer member 550 from the first housing 520.

[0117] In one embodiment, for the convenience of the disassembly and assembly of the second drawer member 550, the sides of the third locking block 552 and the third locking groove 554 are inclined surfaces, so that the third locking block 552 can be placed in the third locking groove 554 and can be easily detached from the third locking groove 554.

[0118] The calculator unit 100 includes a second housing 440, a second display 410, a fourth circuit board 450, a second button module 430 and a third battery 480. The fourth circuit board 450, the third battery 480 and the second display 410 are all arranged in the second housing 440. The second button module 430 is arranged on the second housing 440 and corresponds to the fourth circuit board 450. The third battery 480 and the second display 410 are both electrically connected to the fourth circuit board 450. The third battery 480 and the second display 410 are both located above the fourth circuit board 450. The fourth circuit board 450 calculates the input data when the second button module 430 is operated. The third battery 480 can supply power to the fourth circuit board 450. By operating the second button module 430, the calculator unit 100 can be turned on for calculating numerical values.

[0119] In one embodiment, a second photovoltaic panel 420 is provided on the calculator unit 100. The second photovoltaic panel 420 is electrically connected to the fourth circuit board 450. The third battery 480 is a rechargeable battery. The second photovoltaic panel 420 is used to convert light energy into electrical energy and transmit it to the fourth circuit board 450. The fourth circuit board 450 is used to process the electrical energy transmitted by the second photovoltaic panel 420 and store it in the third battery 480 through the fourth circuit board 450 to extend the service life of the third battery 480 and save resources.

[0120] In one embodiment, a third drawer 470 is detachably provided at the top of the second housing 440 at a position corresponding to the third battery 480. A third placement groove 471 is provided on the third drawer 470. An arched third conductive sheet 451 is provided on the fourth circuit board 450. The third battery 480 is a button battery. The third battery 480 is installed on the third placement groove 471. When the third drawer 470 is assembled to the second housing 440, the third placement groove 471 is placed inside the second housing 440 and below the third conductive sheet 451. One surface of the third battery 480 abuts against the third conductive sheet 451, and the other surface of the third battery 480 abuts against the pad on the fourth circuit board 450. When the third battery 480 runs out of power, the user can detach the third drawer 470 from the second housing 440, replace the third battery 480 and then reinstall it to extend the service life of the product in this embodiment.

[0121] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention 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.

[0122] In addition, the descriptions involving "first", "second", etc. in the present invention 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 of such features. In addition, "and / or" throughout the text includes three scenarios. Taking A and / or B as an example, it includes the technical solution of A, the technical solution of B, and the technical solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0123] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A calculator with a writing tablet, characterized in that, It includes a graphics tablet unit, a calculator unit, and a stylus. The stylus is detachably arranged on the calculator unit or the graphics tablet unit, and the graphics tablet unit is connected to the calculator unit; In the storage state, the graphics tablet unit and the calculator unit are arranged in an up-and-down overlapping manner; In the unfolded state, the surface of the graphics tablet unit is arranged horizontally side by side with the calculator unit; The graphics tablet unit and the calculator unit are connected by one of a rotation method, a magnetic attraction method, a snap connection method, and a sliding method; Among them, when the graphics tablet unit and the calculator unit are rotationally connected, the calculator with a graphics tablet further includes a flexible connection line; a first circuit board and a first clear switch electrically connected to the first circuit board are arranged on the calculator unit, and a first liquid crystal screen is arranged on the graphics tablet unit; a first wire passing hole is formed on one side of the calculator unit close to the graphics tablet unit, and a second wire passing hole is formed on one side of the graphics tablet unit close to the calculator unit; the flexible connection line passes through the first wire passing hole and the second wire passing hole, one end of the flexible connection line is placed inside the calculator unit and welded to the first circuit board, and the other end of the flexible connection line is placed inside the graphics tablet unit and welded to the first liquid crystal screen; when the first clear switch is operated, the first circuit board clears the content displayed on the first liquid crystal screen through the flexible connection line; a first lock switch electrically connected to the first circuit board is further arranged on the calculator unit, and when the first circuit board receives the electrical signal fed back by the first lock switch, the content displayed on the first liquid crystal screen is locked through the flexible connection line; the first clear switch is a Hall switch, and a magnetic field magnet for generating a magnetic field is arranged at the end of the stylus; when the first circuit board receives the electrical signal fed back by the Hall switch, the content displayed on the first liquid crystal screen is cleared through the flexible connection line; When the graphics tablet unit and the calculator unit are connected by a magnetic attraction method; a plurality of third magnetic attraction members are arranged on the graphics tablet unit, and at least part of the third magnetic attraction members are arranged close to the periphery of the graphics tablet unit; a fourth magnetic attraction member adsorbed to the third magnetic attraction member is arranged on the calculator unit; the third magnetic attraction member is a magnet or an iron block, and the fourth magnetic attraction member is a magnet; or, the third magnetic attraction member is a magnet and the fourth magnetic attraction member is an iron block; the third magnetic attraction member and the fourth magnetic attraction member are both strip-shaped, and the three third magnetic attraction members are all arranged along the length direction of the calculator unit, and one third magnetic attraction member is arranged along the width direction of the calculator unit; When the handwriting board unit is slidably connected to the calculator unit; a chute for accommodating the calculator unit is formed on the back surface of the handwriting board unit; in the storage state, the calculator unit is placed in the chute; a limiting rib is arranged on the side wall of the chute, and a second card slot is formed on the limiting rib; a limiting groove for cooperating with the limiting rib is formed on the side wall of the calculator unit, the limiting groove is located at a position close to the end of the calculator unit, and a second locking block for cooperating with the second card slot is arranged on the limiting groove; in the storage state, the limiting rib is placed in the limiting groove, and the second locking block is placed in the second card slot; a supporting convex block protrudes outward on the side of the handwriting board unit away from the chute; When the handwriting board unit is connected to the calculator unit by a buckle; a connecting locking block is arranged on one side wall of the handwriting board unit, and a fourth card slot for cooperating with the connecting locking block is formed on one side wall of the calculator unit, and the connecting locking block is placed in the fourth card slot when the handwriting board unit and the calculator unit are connected; a fifth magnetic member is arranged in the handwriting board unit, and a sixth magnetic member is arranged in the calculator unit, and the fifth magnetic member is adsorbed to the sixth magnetic member when the handwriting board unit and the calculator unit are stored.

2. The calculator with a writing tablet according to claim 1, characterized in that, The handwriting board unit is rotatably connected to the calculator unit; At least one first rotating part is arranged on the handwriting board unit, a second rotating part for cooperating with the first rotating part is arranged on the calculator unit, and the first rotating part and the second rotating part are connected by a shaft rod; At least one first magnetic member is arranged in the calculator unit, a second magnetic member for using with the first magnetic member is arranged on the handwriting board unit, and the first magnetic member is adsorbed to the second magnetic member when the handwriting board unit and the calculator unit are in the storage state; A storage groove for storing a handwriting pen is formed on the calculator unit, and the handwriting pen is fixed by a buckle structure when placed in the storage groove.

3. The calculator with a writing tablet according to claim 2, characterized in that, The calculator unit is provided with a first battery, a second circuit board, a first display and a first button module, the first circuit board and the first display are both electrically connected to the second circuit board, and the first battery is electrically connected to the first circuit board; the first battery, the first circuit board and the first display are all located above the second circuit board, and the second circuit board calculates the input data when the first button module is operated; The calculator unit is provided with a first photovoltaic panel, the first photovoltaic panel is electrically connected to the second circuit board, the first battery is a rechargeable battery, the first photovoltaic panel is used for converting light energy into electrical energy and transmitting it to the second circuit board, and the second circuit board is used for processing the electrical energy transmitted by the first photovoltaic panel and storing it in the first battery through the first circuit board.

4. The calculator with a writing tablet according to claim 3, characterized in that, The first battery is a button battery. An arched first conductive sheet is provided on the first circuit board. A first pull-out member is detachably provided on the calculator unit. A first placement groove is formed in the first pull-out member, and the first battery is disposed in the first placement groove. When a part of the first pull-out member is placed inside the calculator unit, one surface of the first battery abuts against a pad on the first circuit board, and the other surface of the first battery abuts against the first conductive sheet. The first pull-out member is fixed to the calculator unit by screws at one end of the first placement groove. A first elastic member is provided at the other end of the first placement groove of the first pull-out member. A first latch is provided on the first elastic member. A first card slot is formed in the calculator unit at a position corresponding to the first latch, and the first latch is placed in the first card slot when the first pull-out member is installed on the calculator unit.

5. The calculator with a writing tablet according to claim 1, characterized in that, When the handwriting board unit and the calculator unit are connected by one of a rotation method, a magnetic attraction method, a snap connection method, and a sliding method; The handwriting board unit includes a first housing, a second battery, a third circuit board, and a second liquid crystal screen. The third circuit board, the second battery, and the second liquid crystal screen are all disposed inside the first housing. The second liquid crystal screen and the second battery are both electrically connected to the third circuit board. The third circuit board is located above or below the second liquid crystal screen. A first display opening is formed in the surface of the first housing at a position corresponding to the second liquid crystal screen. A second clear switch is provided on the third circuit board. A first pressing member is provided on the first housing at a position corresponding to the second clear switch. The first pressing member is connected to the second clear switch. When the third circuit board detects an electrical signal fed back by the second clear switch, it controls the second liquid crystal screen to clear the displayed content. A second locking switch is provided on the first circuit board. A first operating member is provided on the first housing at a position corresponding to the second locking switch. The first operating member is connected to the second locking switch. When the third circuit board detects an electrical signal fed back by the second locking switch, it locks the content displayed on the second liquid crystal screen. The second locking switch is a DIP switch. The first pressing member is located on the surface of the first housing having the first display opening, and the second locking switch is located at the top of the first housing.

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