JP2016168834A - Writing auxiliary line projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately arrange a sheet while ensuring a wide writing area on the sheet and reduce cost of a device in a writing auxiliary line projection device.SOLUTION: A writing auxiliary line projection device comprises: a casing 4 which is placed on a desk in a state of being separated from a writing object, and in which an emitting port for emitting a laser beam toward the writing object is provided at a predetermined height position; a light emitting part 2 which is provided in the casing and emits the laser light; and a diffraction optical element 10 on which the laser beam emitted from the light emitting part is made incident, and which converts the incident laser beam into a laser beam for a writing auxiliary line. The laser beam converted by the diffraction optical element is emitted from the emitting port of the casing. An optical axis of the laser beam for the writing auxiliary line, which is emitted from the emitting port toward the writing object, is emitted so as to form an acute angle with respect to the writing object. The laser beam for the writing auxiliary line projected onto the desk includes a pattern G of a guide line which instructs a position where the writing object is placed on the desk.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a writing auxiliary line projecting apparatus, for example, a writing auxiliary line projecting apparatus that projects a ruled line as a writing auxiliary line onto a sheet to be projected.

Patent Document 1 discloses a writing auxiliary image display device that displays a writing auxiliary image by scanning a laser beam on paper.
FIG. 11 is a perspective view of a writing auxiliary image display device disclosed in Patent Document 1. FIG. The writing auxiliary image display device 51 is used by being placed like a paperweight on a sheet-like writing object (referred to as paper 50). The writing auxiliary image display device 51 is an optical scanning projection type image display device that forms a writing auxiliary image such as ruled lines and grid lines by scanning a laser beam on the paper 50.

The writing auxiliary image display device 51 includes a laser beam exit 53 in front of a long box-shaped casing 52. The exit port 53 is formed elongated along the longitudinal direction (horizontal direction) of the front surface of the casing 52.
A light emitting portion (not shown) that is a laser light source that emits laser light is disposed in the casing 52, and the laser light is emitted through the emission port 53. The light emitting unit scans the surface of the paper 50 with a laser. Further, in the casing 52, for example, two imaging units (not shown) are arranged on the left and right ends of the front surface of the casing 52 so that images can be taken via the imaging ports 58. Each of these imaging units images an area including the paper 50 and generates image data indicating an area for displaying a writing auxiliary image on the paper 50.

Further, a slot port 55 for mounting a memory card 54 is provided on the side of the casing 52. The memory card 54 stores image data of a writing auxiliary image. By inserting the memory card 54 from the slot 55, the memory card 54 is mounted on a memory mounting portion (not shown) in the casing 52.
The casing 52 includes a reading unit (not shown) that reads image data from the memory card 54 mounted in the memory mounting unit. The image data read out in this way is displayed on the paper 50 by scanning the laser beam by the light emitting unit.
On the upper surface of the casing 52, a plurality of buttons 56 for selecting a writing auxiliary image read from the memory card 54, a liquid crystal display unit 57 for displaying an operation state, and the like are provided.

The writing auxiliary image display device 51 configured as described above is used by being placed on the paper 50 as described above. The light emitting unit (not shown) emits laser light and scans the display area based on the imaging data from the imaging unit, and displays a writing auxiliary image selected by the user (writer).
According to such a writing auxiliary image display device 51, the writing auxiliary image can be reliably displayed on the paper 50, and the writer can assist in writing.

Japanese Patent No. 5370203

However, since the writing auxiliary image display device disclosed in Patent Document 1 is used by being placed on the paper 50, writing cannot be performed in the area where the device is placed, and writing on the paper 50 is not possible. There was a problem that the area was limited (narrowed). In particular, the writing auxiliary image display device disclosed in Patent Document 1 is difficult to apply to small paper such as postcards. Further, even if the paper 50 is placed outside the paper 50 in order to widen the writing area, the position of the paper 50 may be shifted during writing, and writing may continue in a shifted state.
Since a plurality of imaging units are provided in the casing 52, and a scanning area for displaying a writing auxiliary image is detected thereby, the apparatus (casing 52) becomes large. In addition, since there are many steps to display a writing auxiliary image and the number of parts increases, there is a problem that the cost of the apparatus increases. Furthermore, in the conventional apparatus, since the structure and function are complicated, a complicated operation is forced on the user. In such an apparatus for assisting writing, the user is assumed to have a wide range of age groups from old people to children who have a hobby of calligraphy classrooms and copying. Therefore, it is desirable that it can be handled easily.

  The present invention has been made paying attention to the above-described points, and is a writing auxiliary line projection device that projects a writing auxiliary line on a paper surface, and accurately arranges paper while ensuring a wide writing area on the paper. It is another object of the present invention to provide a writing auxiliary line projection apparatus that can reduce the cost of the apparatus and that is easy to handle.

In order to solve the above-described problem, a writing auxiliary line projection apparatus according to the present invention is a writing auxiliary line projection apparatus that projects a writing auxiliary line on a sheet-like writing object placed on a desk, The casing is placed in a state separated from the writing object in which a laser beam is emitted toward the writing object at a predetermined height, and the casing is provided in the casing to emit laser light. And a diffraction optical element that is provided in the casing and receives the laser beam emitted from the light emitting unit and converts the incident laser beam into a laser beam for a writing auxiliary line. The laser beam converted by the diffractive optical element is irradiated from the exit port of the casing, and the optical axis of the writing auxiliary line laser beam irradiated from the exit port to the writing object is a brush The writing auxiliary line laser light emitted so as to have an acute angle with respect to the target and projected onto the desk includes a guide line pattern that indicates a position where the writing target is placed on the desk. .
According to such a configuration, the writing auxiliary line pattern projected on the desk includes the guide line that indicates the position where the paper to be written is placed on the desk. Therefore, the user can place the paper on the desk according to the guide line. In addition, even when the paper position is shifted during writing, the shift can be corrected easily.
Further, since the casing is not placed on the paper, the writing surface can be formed in a wide area on the paper.
Furthermore, in the writing auxiliary line projection apparatus according to the present invention, the desired writing auxiliary line is projected onto the paper (writing object) only by converting the laser beam emitted from the light emitting unit through the diffraction optical element. Therefore, the device configuration is simplified. For this reason, less power is used and the number of parts is reduced, so that it is possible to provide a safe writing auxiliary line projection device that is portable and easy to use. Furthermore, the cost associated with the apparatus can be kept low.

Moreover, it is desirable to provide a fall detection means for detecting the fall of the casing and stopping the emission of the laser light from the light emitting part.
An inadvertent fall of the writing auxiliary line projection apparatus may lead to an accident such as retinal damage caused by laser light. Therefore, by controlling the laser beam emission to stop when the fall detection unit detects a fall, the writing auxiliary line projection apparatus can prevent unnecessary laser beam emission and provide a safe use state.

Moreover, it is desirable to provide an optical system that allows the laser light emitted from the light emitting part to enter the diffraction optical element.
The optical system is preferably a single lens, and a collimator lens that collimates the laser light emitted from the light emitting unit can be used as the single lens.
By providing such an optical system, the laser beam emitted from the light emitting portion can be efficiently incident on the diffraction optical element.

Moreover, it is desirable that the casing further includes a position adjusting unit capable of adjusting the position in at least one axial direction.
By providing such a position adjustment unit, it is possible to better adjust the positional relationship between the user and the writing target on which the writing auxiliary line is projected.

Further, any one of a plurality of diffraction optical elements, a plurality of element holding members that hold the plurality of diffraction optical elements, and a plurality of diffraction optical elements that are held by the plurality of element holding members should be used. And a selection mechanism for selecting.
The multi-element holding member is a member in which a plurality of diffraction optical elements are arranged along a circumferential direction on a disk-shaped plate member, and the selection mechanism rotates the disk-shaped multi-element holding member in the circumferential direction. It is desirable to select the diffraction optical element to be used.
Alternatively, the multi-element holding member is a member in which a plurality of diffraction optical elements are arranged along the longitudinal direction of a long plate member, and the selection mechanism moves the multi-element holding member along the longitudinal direction. You may make it select the diffraction optical element to be used by making it slide.
Alternatively, the diffractive optical element may be replaceable.
By providing such a selection mechanism, the user can easily select and use a desired diffraction optical element (auxiliary line).

The casing further includes a diffractive optical element detector that detects the presence or absence of the diffractive optical element, and the diffractive optical element detector detects the diffractive optical element from the light emitting unit when detecting that the diffractive optical element is removed. It is desirable to control the emission of laser light.
By controlling in this way, unnecessary emission of laser light can be prevented and a safe use state can be provided.

The casing is preferably placed in front of the writing object and projects the writing auxiliary line laser light.
By arranging the casing in this manner, the projected writing auxiliary line is less likely to be a shadow of the user's arm regardless of the user's dominant arm. In addition, since the writing auxiliary line extending in the horizontal direction can be easily projected on the entire paper surface to be written, an excellent effect is exhibited in the case of horizontal writing.
Alternatively, the casing may be placed on the side of the writing target and project the writing auxiliary line laser light. In this case, since the casing is placed on the opposite side of the user's dominant hand, the projected writing auxiliary line is unlikely to be a shadow of the user's arm. Also, such an arrangement is effective for projecting auxiliary lines for vertical writing because the auxiliary lines that extend in the vertical direction can be easily displayed on the entire paper to be written.
Alternatively, the casing is switched between the front position and the side position according to the writing direction to the writing object, and the diffractive optical element is switched according to the position of the casing, A suitable writing auxiliary line laser beam may be projected.

  It is a writing auxiliary line projection device that projects writing auxiliary lines onto the paper surface, and can accurately place the paper while ensuring a wide writing area on the paper, and also keeps the cost of the device low and easy to handle. And a safe writing auxiliary line projection apparatus can be obtained.

FIG. 1 is a sectional view of a writing auxiliary line projection apparatus according to the present invention. FIG. 2 is a front view of the writing auxiliary line projection apparatus of FIG. FIG. 3 is a plan view of the writing auxiliary line projection apparatus of FIG. 4 is an enlarged cross-sectional view of a main part of the writing auxiliary line projection apparatus of FIG. FIGS. 5A to 5C are diagrams illustrating an example of projection of the auxiliary line pattern formed in advance on the DOE. FIGS. 6A and 6B are front views of members used when a plurality of DOEs are switched and used. FIG. 7 is a plan view showing a guide line pattern example. FIGS. 8A and 8B are side views showing the relationship between the height position of the window portion serving as the light emission end and the irradiation angle of the laser beam when A4 size paper is to be projected. FIGS. 9A and 9B are side views showing the relationship between the height position of the window portion serving as the light emission end and the irradiation angle of the laser beam when a postcard-sized sheet is used as the projection size. FIG. 10 is a plan view showing another usage pattern of the writing auxiliary line projection apparatus according to the present invention. FIG. 11 is a perspective view of a conventional disclosed writing auxiliary image display device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a writing auxiliary line projection apparatus according to the present invention, and FIG. 2 is a front view. 3 is a plan view of the writing auxiliary line projection apparatus of FIG. 1, and FIG. 4 is an enlarged cross-sectional view of the main part of the writing auxiliary line projection apparatus.

  The writing auxiliary line projection apparatus 1 includes a casing 4 formed in a rectangular box shape, for example. The writing auxiliary line projection apparatus 1 is installed by placing the casing 4 on the desk surface of the desk 3. In the present embodiment, the vertically long casing 4 is used in an upright state, but is not limited to this shape. As long as a predetermined height for irradiating the laser beam can be secured, various shapes of the casing 4 can be adopted.

In the present embodiment, as an example of the arrangement of the writing auxiliary line projection apparatus 1, a case where the writing auxiliary line projection apparatus 1 is arranged in front of the user 20 as illustrated in FIG. 3 will be described.
In the casing 4, a power supply unit 5 (battery in this example) is provided at the lower part thereof. By providing the power supply unit 5 at the lower part of the casing, the center of gravity of the writing auxiliary line projection apparatus 1 is lowered. Therefore, the writing auxiliary line projection apparatus 1 is stably placed on the desk. A lighting control circuit 6 formed on the substrate is provided in the casing 4, and power is supplied from the power supply unit 5 to the lighting control circuit 6. Further, a laser unit 2 (light emitting portion) that is driven by a control signal from the lighting control circuit 6 is provided in the upper portion of the casing 4.
The casing 4 is provided with a power switch 14 as shown in FIG. When the power switch 14 is turned on, a current is supplied from the power supply unit 5 to the lighting control circuit 6 and the laser unit 2. The power switch 14 may be a wired or wireless external operation device so that remote control is possible.

The laser unit 2 includes a laser driving circuit 7 formed on a substrate, a laser diode 8 for emitting laser light, an optical system 9 for processing the laser light to enter a diffractive optical element to be described later, and writing assistance. It has DOE (Differential Optical Elements) 10 which is a diffraction optical element from which the laser beam used as a line is emitted. For the optical system 9, for example, a collimating lens 9 that collimates (makes parallel light) laser light is used.
When the laser driving circuit 7 operates, the laser diode 8 emits laser light, and this laser light enters the collimating lens 9. The collimating lens 9 collimates the incident laser light and enters the DOE 10. The laser light incident on the DOE 10 is projected onto the paper P as a writing auxiliary line.
Although the optical system 9 has been described as a collimating lens, it may be a single lens having an arbitrary focal length or may be composed of a plurality of single lenses. The optical system 9 has a function of processing laser light emitted from the laser diode 8 into a state suitable for the DOE 10. Therefore, it is desirable that the optical system 9 is designed or arranged so that the laser light that has passed through the optical system 9 has the same dimension as the pattern formed on the DOE 10.

The wavelength of the laser emitted from the laser unit 2 is, for example, 635 nm, and the laser output is 1 mW.
The DOE 10 converts collimated laser light into an arbitrary shape (auxiliary line), emits it, and projects it onto an object.
In addition, a window 11 serving as a laser beam emission port is provided on the upper front surface of the casing 4, and the laser beam that has passed (converted) through the DOE 10 passes through the window 11 and is projected into a projection region 15 (FIG. 3) is projected as an auxiliary line.

  The pattern of the auxiliary line H to be projected is an auxiliary line pattern having a shape formed in advance in the DOE 10 (basically, one auxiliary line pattern per one DOE). Specific auxiliary line patterns include, for example, vertical ruled lines as shown in FIG. 5A, horizontal ruled lines as shown in FIG. 5B, and checkered lines as shown in FIG. 5C. Various patterns such as ruled lines can be used. Further, an auxiliary line may be projected by a combination of various patterns such as a large number of dots and broken lines, not a continuous line.

Moreover, it is preferable that one auxiliary writing line projection device 1 can project a plurality of auxiliary lines as described above. In order to change the pattern of the auxiliary line to be projected, it is desirable that a plurality of DOEs 10 corresponding to each auxiliary line pattern can be exchanged. In this case, the DOE 10 may be manually replaced by the user. For example, as illustrated in FIG. 6A, a disk-shaped member 21 may be provided in the casing 4, and a plurality of DOEs 10 having different auxiliary line patterns may be disposed along the circumferential direction of the disk-shaped member 21. The desired DOE 10 can be selected by rotating the disk-shaped member 21.
Alternatively, as shown in FIG. 6B, a plurality of DOEs 10 having different auxiliary line patterns may be arranged along the longitudinal direction of the long plate member 22. The desired DOE 10 can be selected by sliding the plate member 22 in its longitudinal direction.

In any method for exchanging the DOE 10, it is desirable for safety to control the emission of the laser light from the light emitting unit from the start of the exchange to the completion of the exchange.
For example, a sensor (a diffractive optical element detector) that detects the presence or absence of the DOE 10 may be provided at an attachment position (also referred to as an attachment portion) of the DOE 10 of the casing 4. When the DOE 10 is replaced, the user may unexpectedly look into the window portion 11. That is, if the laser beam is emitted when the DOE 10 is replaced, the laser beam may enter the user's eyes and an accident such as retinal damage may occur. In the control for stopping the emission of the laser beam, for example, a control for stopping the operation of the laser unit 2, a control for blocking the laser beam with a shutter (not shown), and a control for diffusing the laser beam with the shutter are appropriately used. .
The diffractive optical element detection unit controls the lighting control circuit 6. For the diffraction optical element detection unit, for example, a known detection means such as a switch or an infrared sensor is used. If it is a switch, when the DOE 10 is removed, the contact is cut off and the laser unit 2 is turned off. When the DOE 10 is attached, the contact is conducted and the laser unit 2 is turned on. Control can be applied. If the DOE 10 is attached, the infrared sensor detects the reflection of the infrared ray by the DOE 10 and turns on the laser unit 2. When the DOE 10 is removed, the infrared ray is transmitted, so the reflection can be detected. Without turning off the laser unit 2.

Further, as shown in FIG. 7, the auxiliary line projected from the DOE 10 is arranged along a corner of the paper P (for example, A4 size paper, postcard, etc.) to be written (for example, “Kuno A guide line pattern G ("shaped" or "cross-shaped") is included together with an auxiliary line pattern H. The guide line pattern G is formed in accordance with the corner of the paper P to be written. The guide line pattern G is preferably projected in accordance with at least two corners on the upper left and right as shown. However, when the guide line is formed long, it may be projected so as to correspond to any one corner of the paper P.
This facilitates the alignment of the paper P on the desk 3, and the auxiliary line is projected on the paper P without tilting.

Further, the irradiation angle of the laser beam is determined by the height position of the DOE 10 serving as the light emission end, that is, the height position of the window portion 11. That is, in order to form the projection region 15 at an appropriate position on the desk 3, it is important to set the height of the window portion 11. Specifically, as shown in FIG. 8A, when the depth of the desk 3 is 450 mm, the paper size is A4, and the height of the light emitting end located at the window 11 of the casing 4 is 80 mm, The angle of the optical axis with respect to is about 24 °. At this time, the irradiation angle to the position of the guide line for designating the upper end position of the sheet with respect to the desk surface is about 46 °, and the irradiation width angle from there to the lower end of the projection area is about 34 °.
Further, as shown in FIG. 8B, when the height of the window 11 (light emitting end) of the casing 4 is 100 mm, the angle of the optical axis with respect to the desk surface is about 29.5 °. At this time, the irradiation angle to the position of the guide line that specifies the upper end position of the sheet with respect to the desk top surface is about 52 °, and the irradiation width angle from there to the lower end of the projection region is about 37 °.

9A, when the depth of the desk 3 is 450 mm, the paper size is a postcard size, and the height of the light emitting end located at the window 11 of the casing 4 is 80 mm, the angle of the optical axis with respect to the desk top surface. Is about 24 °. At this time, the irradiation angle to the position of the guide line for designating the upper end position of the sheet with respect to the desk top surface is about 32 °, and the irradiation width angle from there to the lower end of the projection area is about 16 °.
As shown in FIG. 9B, when the height of the window 11 (light emitting end) of the casing 4 is 100 mm, the angle of the optical axis with respect to the desk surface is 29.5 °. At this time, the irradiation angle to the position of the guide line for designating the upper end position of the sheet with respect to the desk top surface is about 38 °, and the irradiation width angle from there to the lower end of the projection area is about 18 °.

  In DOE, since the projection distance is constant over the entire sheet, irradiation from directly above is the most efficient. However, the hand becomes in the way of writing, and ruled line display cannot be projected. In contrast, the smaller the angle formed between the optical axis and the desk surface, the greater the distortion of the projected ruled line. Therefore, as described above, the desirable angle of the optical axis with respect to the desk surface (projection target) is an acute angle of 20 ° to 45 °. By projecting the ruled line at such an angle, the shadow of the user's hand does not occur and these problems are solved.

In addition, as the height of the window 11 (light exit end) is increased, the angle formed by the optical axis and the desk surface is closer to 90 ° (directly above), and the irradiation efficiency is improved. There is a problem that sometimes hands get in the way. Moreover, when the height dimension of a casing becomes large, the problem that not only compactness (easy handling) will be impaired but it will fall easily when mounted.
Therefore, the height position of the window portion 11 (light emission end) is preferably not more than 100 mm (80 to 100 mm as illustrated). The desirable angle of the optical axis is an acute angle of 20 ° to 45 ° from the relationship between the position of the window 11 and the paper.

Although not shown, it is desirable to detect the fall when the casing 4 falls. As the fall detection means, for example, a sensor for detecting the inclination angle of the casing 4 in the casing 4, an acceleration sensor for detecting the tilting operation of the casing 4, or detecting that the bottom surface of the casing 4 is separated from the installation surface on the desk. A sensor is used. There is a possibility that an accident such as retinal damage caused by laser light may be caused by an inadvertent fall of the writing auxiliary line projection apparatus 1. Therefore, by controlling the laser beam emission to stop when the fall detection unit detects a fall, the writing auxiliary line projection apparatus 1 can prevent unnecessary laser beam emission and provide a safe use state. The fall detection means may be provided at any location within the casing 4. For example, the fall detection means may be mounted on the lighting control circuit 6, disposed on the bottom surface of the casing 4, and electrically connected to the lighting control circuit 6.
Further, as shown in FIG. 2, an indicator 13 such as an LED that indicates a laser light irradiation state (power on, off, temporary stop, etc.) may be provided on the casing 4. Thereby, the user can immediately confirm the state of laser irradiation, and the writing auxiliary line projection apparatus 1 is preferable from the viewpoint of safety.

When using the writing auxiliary line projection apparatus 1 configured in this way, as shown in FIG. 3, for example, the user 20 sitting in front of the desk 3 moves the window 11 of the casing 4 to the front (user 20 side). The casing 4 is placed on the desk (the object to be written) in a state of facing toward.
Next, a power switch (not shown) is turned on, the laser unit 2 is driven, and a desired writing auxiliary line pattern is projected from the window 11 through the DOE 10 onto the desk.
Here, the writing auxiliary line pattern projected on the desk includes a guide line pattern G in accordance with the corner of the paper P to be written. The guide line pattern G instructs the user 20 to place the paper P, so that the paper P is placed at an appropriate position on the desk according to the guide line.
In addition, a desired writing auxiliary line is displayed by laser light on the paper placed on the desk. This writing auxiliary line assists the writing of the user 20, and for example, realizes writing with a stable character size, spacing, arrangement, and the like.

In the present embodiment, as illustrated in FIG. 3, the case where the writing auxiliary line projection device 1 (casing 4) is disposed in front of the user 20 has been described as an example. With such a configuration, the projected writing auxiliary line is less likely to be a shadow of the user 20 arm regardless of the dominant arm of the user 20. In addition, such a configuration exhibits an excellent effect in horizontal writing because it is easy to project a writing auxiliary line on the entire paper surface in the horizontal direction of the paper to be written. However, the mounting position of the writing auxiliary line projection apparatus 1 is not limited to the front of the user 20. For example, the placement position of the writing auxiliary line projection apparatus 1 may be on the side of the user 20 as shown in FIG. At this time, the writing auxiliary line projection device 1 (casing 4) is placed on the side opposite to the dominant hand of the user 20, so that the writing auxiliary line is less likely to be a shadow of the user 20's arm. Further, such an arrangement is effective for projecting auxiliary lines for vertical writing because the writing auxiliary lines are displayed in an easy-to-see manner in the entire vertical direction of the paper to be written.
Moreover, in order to utilize said effect effectively, the mounting position of the writing auxiliary line projection apparatus 1 (casing 4) may be selectable according to each direction (vertical writing or horizontal writing). At this time, the DOE 10 may be switched in accordance with the placement position of the writing auxiliary line projection apparatus 1 (casing 4). For example, when a right-handed user 20 writes a character in horizontal writing, if the placement position of the writing auxiliary line projection apparatus 1 (casing 4) is the front, the first two to three lines of writing auxiliary lines are shadows of the hand. May continue to be. At this time, a clear writing auxiliary line is displayed at the writing position by changing the placement position of the writing auxiliary line projection apparatus 1 (casing 4) to the left.

As described above, according to the embodiment of the present invention, the writing auxiliary line pattern projected on the desk includes the guide line that matches the corner of the paper to be written. Therefore, the user can place the paper on the desk according to the guide line. In addition, even when the paper position is shifted during writing, the shift can be corrected easily.
Further, since the casing 4 is not placed on the paper, a writing surface can be formed in a wide area on the paper.
Furthermore, in the writing auxiliary line projection apparatus 1 according to the present invention, a desired writing auxiliary line can be projected onto a sheet only by converting the laser light emitted from the laser unit 2 through the DOE 10. Becomes easy. For this reason, less power is used and the number of parts is reduced, so that it is possible to provide a safe writing auxiliary line projection device that is portable and easy to use. Furthermore, the cost related to the apparatus can be suppressed low.

  In the embodiment described above, vertical ruled lines, horizontal ruled lines, grid lines, etc. are shown as examples of auxiliary line patterns formed in advance in the DOE 10, but the present invention is not limited to this. The DOE 10 may be configured to display or pictures as auxiliary lines.

  Further, when the writing auxiliary line projection apparatus according to the present invention is placed, at least one axial direction, more preferably as shown in FIG. 1, the width direction (Y direction), the depth direction (X direction), the height direction (Z direction). ) In the three-axis direction may be provided with a position adjustment unit 12 capable of adjustment by about 50 mm. A conventional technique can be applied to the position adjustment unit 12. For example, an apparatus called an XYZ stage may be provided in the casing 4.

1 Writing Auxiliary Line Projector 2 Laser Unit (Light Emitting Unit)
3 Desk 4 Casing 5 Power supply 6 Lighting control circuit 7 Laser drive circuit 8 Laser diode 9 Collimating lens 10 DOE (Diffraction optical element)
11 Window 12 Position Adjustment Unit 13 Indicator 14 Power Switch 15 Projection Area 20 User

Claims (14)

A writing auxiliary line projection device that projects a writing auxiliary line on a sheet-like writing object placed on a desk,
A casing that is placed in a state separated from the writing object on the desk, and an emission port that emits a laser beam toward the writing object is provided at a predetermined height position;
A light emitting portion provided in the casing and emitting laser light;
A diffractive optical element that is provided in the casing and receives the laser light emitted from the light emitting portion and converts the incident laser light into a laser beam for a writing auxiliary line;
The laser beam converted by the diffraction optical element is irradiated from the exit of the casing,
The optical axis of the writing auxiliary line laser light irradiated from the exit to the writing object is emitted so as to have an acute angle with respect to the writing object,
The writing auxiliary line laser beam projected on the desk includes a guide line pattern that indicates a position where the writing target is placed on the desk.   The writing auxiliary line projection apparatus according to claim 1, further comprising a fall detection unit that detects the fall of the casing and stops the emission of the laser light from the light emitting unit.   The writing auxiliary line projection apparatus according to claim 1, further comprising an optical system that allows the laser light emitted from the light emitting unit to be incident on the diffraction optical element.   The writing auxiliary line projection apparatus according to claim 1, wherein the casing further includes a position adjusting unit capable of adjusting a position in at least one axial direction. A plurality of the diffraction optical elements;
A plurality of element holding members for holding the plurality of diffraction optical elements;
A selection mechanism for selecting one of a plurality of diffraction optical elements held by the plurality of element holding members;
The writing auxiliary line projection apparatus according to any one of claims 1 to 4, further comprising: The multi-element holding member is
A member in which a plurality of diffraction optical elements are arranged along a circumferential direction on a disk-shaped plate member,
6. The writing auxiliary line projection apparatus according to claim 5, wherein the selection mechanism selects a diffraction optical element to be used by rotating the disk-shaped plural element holding member in a circumferential direction. The multi-element holding member is
A member in which a plurality of diffraction optical elements are arranged along the longitudinal direction of a long plate member,
6. The writing auxiliary line projection apparatus according to claim 5, wherein the selection mechanism selects a diffraction optical element to be used by sliding the multi-element holding member along the longitudinal direction. The diffractive optical element is replaceable;
The writing auxiliary line projection apparatus according to any one of claims 1 to 4, wherein: The casing further comprises a diffractive optical element detector for detecting the presence or absence of the diffractive optical element,
The diffractive optical element detection unit controls the emission of the laser light from the light emitting unit when detecting that the diffractive optical element is removed;
The writing auxiliary line projection apparatus according to claim 8. The optical system is a single lens;
The writing auxiliary line projection apparatus according to claim 3, wherein the writing auxiliary line projection apparatus is a writing auxiliary line projection apparatus. The single lens is a collimating lens that collimates the laser light emitted from the light emitting portion;
The writing auxiliary line projection apparatus according to claim 10. The casing is placed in front of the writing object and projects the writing auxiliary line laser light;
The writing auxiliary line projection apparatus according to claim 1, wherein the writing auxiliary line projection apparatus is a writing auxiliary line projection apparatus. The casing is placed on a side of the writing target and projects the writing auxiliary line laser light;
The writing auxiliary line projection apparatus according to claim 1, wherein the writing auxiliary line projection apparatus is a writing auxiliary line projection apparatus. The casing is switched to either the front or the side according to the writing direction to the writing object,
The diffractive optical element is switched according to the position of the casing, and projects the writing auxiliary line laser light suitable for the writing direction.
The writing auxiliary line projection apparatus according to claim 1, wherein the writing auxiliary line projection apparatus is a writing auxiliary line projection apparatus.

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