Desk lamp

Abstract

The system aims to improve usability by ensuring the desired illumination level for each area through simple operation. [Solution] The device comprises an arm, a connecting part, and a pair of lighting units, the pair of lighting units being rotatable to be in at least a first and second configuration with different positional relationships, the first and second regions being areas with radii of 30 cm and 50 cm, respectively, centered on a reference position on the work surface, and the third region being a square area with sides of 30 cm, with the reference position on the work surface as one vertex, the first region being illuminated with 1000 lux or more by the pair of lighting units in the first configuration and the second region being illuminated with 500 lux or more, and the third region being illuminated with 1500 lux or more by the pair of lighting units in the second configuration.

Description

Technical Field

[0001] The present invention relates to the technical field of a desk lamp having a pair of lighting units.

Background Art

[0002] There is a desk lamp for illuminating necessary areas and objects on a desk (see, for example, Patent Document 1).

[0003] In the desk lamp described in Patent Document 1, a connecting portion connected to an arm portion and a lighting portion (head portion) having a light source connected to the connecting portion are provided, and the illuminance directly below the lighting portion on the work surface (desk surface) is 500 lux or more while holding the lighting portion at a predetermined height with respect to the work surface.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in the case of the above-described desk lamp, in addition to general-purpose types such as study lights, there is also a work type that illuminates objects on which fine work is performed by the user (operator)'s visual inspection, and the required illuminance (brightness) differs for each necessary area according to the use and type of work.

[0006] For example, JIS (Japanese Industrial Standards) C 8112 is an industrial standard for LED (Light Emitting Diode) desk lamps, and desk lamps are developed in accordance with this standard. The illuminance requirements in this standard specify the illuminance on a circle with a radius of one-third in front of the point directly below the light source center of the desk lamp, that is, within a 120-degree range from the reference position. Furthermore, as classifications of desk surface illuminance, Type A and Type AA are defined according to the illuminance irradiated within the aforementioned 120-degree range. For example, to meet the requirements of the high-illuminance Type AA, it is necessary to have at least 500 lux on a circle with a radius of 30 cm in front of the stand (within a 120-degree range) and at least 250 lux on a circle with a radius of 50 cm in front of the stand (within a 120-degree range). However, since desks are generally rectangular, the aforementioned 120-degree range specified in the standard has the problem that even if high illumination is ensured, only a portion of the desk meets the illumination requirements. In order to effectively utilize the entire desk surface for visual work, a desk lamp that illuminates every corner of the desk with 500 lux or more is required.

[0007] Furthermore, there is another standard called JIS Z 9110, which specifies basic illumination requirements for indoor work and for residential use. This standard stipulates that 1500 lux or more is required for very precise visual work. In other words, while drafting and detailed visual work are typical examples, the demand for and diversity of visual work at desks indoors has increased, especially recently due to teleworking, so there is a need for desk lamps that can illuminate an appropriate area with high illumination.

[0008] Furthermore, it is desirable that the illumination level in each area be ensured through simple operation, thereby improving usability.

[0009] Therefore, the present invention aims not only to meet the standards of JIS C 8112, which are widely available on the market, but also to improve usability by enabling illumination of 500 lux or more to every corner of the desk surface in order to effectively utilize the entire desk surface for visual work, and by ensuring the optimal illuminance (maximum of 1500 lux or more) for each area of ​​the desk surface according to the content of the visual work with simple operation, so that work can be performed even during very detailed visual work as defined in JIS Z 9110. [Means for solving the problem]

[0010] The desk lamp according to the present invention comprises an arm portion that functions as a support column, a connecting portion connected to the arm portion, and a pair of lighting units having a light source and rotatably connected to the connecting portion, wherein the pair of lighting units are rotatable to be in at least a first and second configuration with different positional relationships, and with the intersection of the arm portion and the work surface illuminated by the pair of lighting units as the reference position, the areas with a radius of 30 cm and a radius of 50 cm on the work surface centered on the reference position are defined as the first and second regions, respectively, and the area with a square of sides of 30 cm on the work surface with the reference position as one vertex is defined as the third region, the first region is illuminated with 1000 lux or more by the pair of lighting units in the first configuration and the second region is illuminated with 500 lux or more, and the third region is illuminated with 1500 lux or more by the pair of lighting units in the second configuration.

[0011] As a result, the first and second regions are illuminated by a pair of lighting units in the first configuration with 1000 lux or more and 500 lux or more, respectively, while the third region is illuminated by a pair of lighting units in the second configuration with 1500 lux or more. [Effects of the Invention]

[0012] According to the present invention, the first and second regions are illuminated with 1000 lux or more and 500 lux or more, respectively, by a pair of lighting units in the first configuration, and the third region is illuminated with 1500 lux or more by a pair of lighting units in the second configuration. Therefore, the desired illuminance for each region can be secured by a simple operation of rotating the connecting part of the lighting units, thereby improving usability. [Brief explanation of the drawing]

[0013] [Figure 1] Figures 2 to 10 illustrate an example of an embodiment of the present invention, and this figure is a perspective view showing the desk lamp placed on the work surface in the first embodiment. [Figure 2] This is a side view of the desk lamp. [Figure 3] This is a plan view of a desk lamp. [Figure 4] This is a perspective view showing the lighting section, etc. [Figure 5] This is a perspective view of a desk lamp with the lighting unit in its second configuration. [Figure 6] This is a perspective view of a desk lamp with the lighting unit in its third configuration. [Figure 7] This is a perspective view of the desk lamp in its retractable state. [Figure 8] This diagram shows the illuminance when the lighting unit is in the first configuration. [Figure 9] This diagram shows the illuminance when the lighting unit is in its second configuration. [Figure 10] This diagram shows the illuminance when the lighting unit is in the third configuration. [Modes for carrying out the invention]

[0014] The embodiments for implementing the desk lamp of the present invention will be described below with reference to the attached drawings.

[0015] The desk light described below has a configuration having an arm portion that functions as a support column and a pair of lighting portions, and in the following description of the desk light, the front-back, up-down, and left-right directions will be described in a state where it is placed on the work surface and the arm portion extends vertically.

[0016] However, the front-back, up-down, and left-right directions shown below are for convenience of explanation, and with respect to the implementation of the present invention, it is not limited to these directions.

[0017] <Configuration of the desk light> The desk light 1 has a stand portion 2 placed on the work surface 100 of the desk, an arm portion 3 that functions as a support column, a connecting portion 4 connected to the upper end portion of the arm portion 3, and a pair of lighting portions 5 that illuminate the work surface 100 (see FIGS. 1 to 3).

[0018] The stand portion 2 has a placement portion 6 formed in a flat plate shape and a protruding portion 7 protruding upward from the rear end portion of the placement portion 6. The protruding portion 7 protrudes from the central portion in the left-right direction of the placement portion 6.

[0019] [[ID=1,7]] The arm portion 3 has a support portion 8 formed in a straight line and a connector portion 9 provided on the rear surface of the support portion 8. The length of the support portion 8 is, for example, from 50 cm to 70 cm. The arm portion 3 is connected such that the lower end portion of the support portion 8 is rotatable with respect to the upper end portion of the protruding portion 7 via a rotation shaft 10. Various connection terminals 9a including power supply terminals are formed on the connector portion 9. Note that the stand portion 2 may not have the protruding portion 7 and the lower end portion of the support portion 8 may be rotatably connected to the placement portion 6 via the rotation shaft 10.

[0020] The axial direction of the rotation shaft 10 is in the left-right direction. Therefore, the arm portion 3 is rotatable in the front-back direction with respect to the stand portion 2 with the rotation shaft 10 as a fulcrum.

[0021] The connecting portion 4 has a linearly formed base portion 11 and a lighting support portion 12 that is continuously provided at the front end of the base portion 11. The length of the connecting portion 4 is, for example, 15 cm to 25 cm. The rear end of the base portion 11 of the connecting portion 4 is rotatably connected to the upper end of the projection portion 7 via a first hinge shaft 13 and a second hinge shaft 14. The width of the lighting support portion 12 is greater than the width of the base portion 11.

[0022] The first hinge shaft 13 is oriented vertically, and the second hinge shaft 14 is oriented horizontally. The first hinge shaft 13 and the second hinge shaft 14 are positioned overlapping vertically, with their axial directions perpendicular to each other. Therefore, the connecting portion 4 is rotatable horizontally with respect to the arm portion 3 using the first hinge shaft 13 as a pivot point, and is also rotatable vertically with respect to the arm portion 3 using the second hinge shaft 14 as a pivot point.

[0023] The lighting unit 5 is formed in a straight line and has a light source holder 15 and a light-emitting unit 16 held by the light source holder 15 (see Figure 4). The length of the lighting unit 5 is, for example, 20 cm to 40 cm.

[0024] The lower surface of the light source holder 15 is provided with a frame-shaped light-shielding rib 15a that protrudes downward. The light-shielding rib 15a is formed in the shape of a rectangular frame that is long in the longitudinal direction of the light source holder 15.

[0025] The light-emitting section 16 is located inside the light-shielding rib 15a. The light-emitting section 16 has multiple light sources (not shown), and for example, light-emitting diodes (LEDs) are used as light sources. The light sources are arranged, for example, in two rows, spaced apart in the longitudinal direction of the light source holder 15. As an example, in this embodiment, 24 white LEDs equivalent to 0.5 watts with a temperature of 6500 Kelvin are arranged in one row, and this is done in two rows for a total of 48 LEDs. The color temperature can be any from 2000 Kelvin to 8000 Kelvin. Alternatively, one row of 24 LEDs may be 6500 Kelvin and the other row may be 24 LEDs of 2700 Kelvin, and the color temperature may be changed within the range of 2700 Kelvin to 6500 Kelvin by changing the dimming ratio of each row. Needless to say, each row can be dimmed by pulse width modulation (PWM) control.

[0026] By arranging the light sources in two rows along the longitudinal direction, it is possible to illuminate a wide area with high illuminance.

[0027] The lighting unit 5 is rotatably connected at one end in the longitudinal direction to the lighting support unit 12 via a pivot shaft 17 (see Figure 3). The pivot shaft 17 is oriented vertically. Therefore, the lighting unit 5 is rotatable left and right relative to the connecting unit 4 using the pivot shaft 17 as a pivot point. A pair of pivot shafts 17 are provided on the lighting support unit 12, spaced apart on the left and right, and each pair of lighting units 5 is rotatable independently relative to the connecting unit 4 using the pivot shaft 17 as a pivot point.

[0028] As described above, the light source holder 15 of the lighting unit 5 is provided with light-shielding ribs 15a located around the light-emitting unit 16. Therefore, even when the lighting unit 5 is adjusted to a position higher than eye level, a portion of the light emitted from the light source is shielded by the light-shielding ribs 15a, preventing direct light emitted from the light source from entering the worker's eyes and reducing glare for the worker.

[0029] <Rotational motion in desk lamps> As described above, the desk lamp 1 is provided with a pivot shaft 10, a first hinge shaft 13, a second hinge shaft 14, and a pair of pivot shafts 17 at each position, so that it can be set to various states by rotating each part.

[0030] For example, the arm section 3 rotates relative to the stand section 2 around the pivot axis 10, allowing the position of the lighting section 5 to be moved forward, backward, up, and down, thereby changing the position of the light emitted from the light-emitting section 16 (see Figure 2). Furthermore, the connecting section 4 rotates relative to the arm section 3 around the first hinge axis 13 and the second hinge axis 14, allowing the position of the lighting section 5 to be moved forward, backward, up, down, and left, and right, thereby changing the position of the light emitted from the light-emitting section 16 (see Figures 2 and 3). Additionally, the lighting section 5 rotates relative to the connecting section 4 around the pivot axis 17, allowing the position of the lighting section 5 to be moved forward, backward, and left, and left, thereby changing the position of the light emitted from the light-emitting section 16 (see Figure 3). In this case, since the pair of lighting sections 5 are rotatable independently of the connecting section 4, the pair of lighting sections 5 can be rotated to the positions required for each task, thereby changing the position of the light emitted from the light-emitting section 16.

[0031] In the desk lamp 1, the first form is one in which a pair of lighting units 5 extend to the left and right and are positioned on the same straight line (see Figure 1).

[0032] Furthermore, in the desk lamp 1, a second form is defined as a state in which one lighting unit 5 extends forward and backward and the other lighting unit 5 extends left and right (see Figure 5). The second form is a state in which one of the lighting units 5 is rotated 90 degrees relative to the connecting unit 4 in the first form, so that the pair of lighting units 5 are perpendicular to each other and the angle between them is 90 degrees.

[0033] Furthermore, in the desk lamp 1, a third configuration is defined as a state in which the pair of lighting units 5 extend diagonally in the front, back, left, and right directions (see Figure 6). The third configuration is a state in which the pair of lighting units 5 are rotated by the same angle relative to the connecting unit 4 in the first configuration, and the angle between the pair of lighting units 5 is, for example, between 100 and 110 degrees.

[0034] Furthermore, in the desk lamp 1, it is possible to rotate the pair of lighting units 5 so that they are aligned with the connecting unit 4, so that the connecting unit 4 and the pair of lighting units 5 are aligned in a straight line, so that the connecting unit 4 is rotated so that it overlaps the support unit 8 with respect to the arm unit 3, and so that the arm unit 3 is rotated so that it overlaps the stand unit 2 with the pair of lighting units 5 in between (see Figure 7). This configuration is suitable when the desk lamp 1 is not in use and is ideal when storing or transporting the desk lamp 1.

[0035] As described above, in the desk lamp 1, the arm portion 3 is rotatably connected to the stand portion 2 with the pivot shaft 10 as the fulcrum, and the axial direction of the pivot shaft 10 is the same as the axial direction of the second hinge shaft 14, so that the connecting portion 4 can be rotated relative to the arm portion 3 with the second hinge shaft 14 as the fulcrum, and the arm portion 3 can be rotated relative to the stand portion 2 with the pivot shaft 10, whose axial direction is the same as the axial direction of the second hinge shaft 14, as the fulcrum.

[0036] Therefore, by folding the lighting unit 5 and the connecting unit 4 relative to the arm unit 3, and folding the arm unit 3 relative to the stand unit 2, the desk lamp 1 can be made smaller, improving its storage and portability.

[0037] Furthermore, in the desk lamp 1, the connecting part 4 is rotatably connected to the arm part 3 with a first hinge shaft 13 and a second hinge shaft 14, which are oriented perpendicular to each other in their axial directions, as pivot points.

[0038] Therefore, by rotating the connecting part 4 with respect to the arm part 3 using the first hinge shaft 13 and the second hinge shaft 14 as pivot points, the lighting part 5 can be moved to any position in three dimensions, allowing the necessary area on the work surface 100 to be illuminated with the desired illuminance, thereby improving usability.

[0039] Furthermore, the axial direction of the pivot axis 17 and the axial direction of the first hinge axis 13 are in the same direction.

[0040] Therefore, the lighting unit 5 can be rotated relative to the connecting unit 4 using the pivot axis 17 as a pivot point, and the connecting unit 4 can be rotated relative to the arm unit 3 using the first hinge axis 13, whose axial direction is the same as the axial direction of the pivot axis 17, as a pivot point. Thus, the rotation of the lighting unit 5 and the rotation of the connecting unit 4 can be performed easily and quickly as a series of operations.

[0041] In addition, the above example shows a desk lamp 1 equipped with a stand portion 2 that is placed on the work surface 100. However, the desk lamp 1 may also be configured to have a clamp-type stand portion that clamps the outer perimeter of a desk or the like from above and below, instead of the stand portion 2. Furthermore, in such a configuration, a hinge portion may be provided at the connection between the portion that is clamped to the desk or the like and the arm portion 3, so that the arm portion 3 can rotate relative to the portion that is clamped.

[0042] <Lighting conditions in a desk lamp> Desk lamp 1 is used, for example, as lighting when studying, reading, or performing other tasks on the work surface 100 of a desk. The following describes, as an example, the lighting state of desk lamp 1 on a work surface 100 measuring 100 cm wide and 60 cm long (see Figures 8 to 10).

[0043] In the following description, the support portion 8 of the arm portion 3 is extended vertically, and the connecting portion 4 is extended horizontally. The point where the arm portion 3 intersects with the work surface 100 illuminated by the pair of lighting units 5 is defined as the reference position V. At this time, because the support portion 8 is extended vertically, the height of the pair of lighting units 5 is set to a height of 50 cm to 70 cm. In the example in the following description, the height of the pair of lighting units 5 is, for example, 54 cm.

[0044] Furthermore, the illuminance on the work surface 100 is represented in each figure by the intensity of a gradient. The higher the gradient density, the higher the illuminance in the area when illuminated by the pair of lighting units 5. The area with the lowest gradient density is area A, which is illuminated with an illuminance of less than 500 lux. The area with a higher gradient density than area A is area B, which is illuminated with an illuminance of 500 lux or more but less than 1000 lux. The area with a higher gradient density than area B is area C, which is illuminated with an illuminance of 1000 lux or more but less than 1500 lux. The area with a higher gradient density than area C is area D, which is illuminated with an illuminance of 1500 lux or more.

[0045] Figure 8 shows the illuminance when the pair of lighting units 5 are in the first configuration, for example, when the reference position V is located in the center in the left-right direction at the rear end of the work surface 100. In the first configuration, the pair of lighting units 5 extend left and right, are positioned on the same straight line, and are aligned with the first edge 101, which is the rear edge of the work surface 100.

[0046] In this case, if the area with a radius of 30 cm centered on the reference position V on the work surface 100 is defined as the first area P, and the area with a radius of 50 cm centered on the reference position V on the work surface 100 is defined as the second area Q, then the pair of lighting units 5 illuminate the first area P with 1000 lux or more and the second area Q with 500 lux or more.

[0047] Such illumination conditions are effective, for example, when working in a relatively narrow area on the work surface 100. By performing work with high illumination in a relatively narrow area, it is possible to ensure high work efficiency. In particular, such illumination conditions satisfy the AA type in JIS C 8112 and ensure the illumination recommended for various tasks such as reading, studying, handicrafts, and sewing as specified in JIS Z 9110, thereby ensuring high work efficiency by providing sufficient illumination during various tasks.

[0048] Figure 9 shows the illuminance when the pair of lighting units 5 are in the second configuration, for example, when the reference position V is at one corner 100a on the rear side of the work surface 100. In the second configuration, the pair of lighting units 5 are orthogonal to each other, with one lighting unit 5 aligned along the first edge 101 of the work surface 100 and the other lighting unit 5 aligned along the second edge 102, which is the side edge of the work surface 100.

[0049] At this time, if we define the third region R as a square area with sides of 30 cm, with the reference position V on the work surface 100 as one of its vertices, then the third region R is illuminated by the pair of lighting units 5 with an intensity of 1500 lux or more.

[0050] Such illumination conditions are effective, for example, when performing precise work in a narrow area on the work surface 100, and high work efficiency can be ensured by performing work with high illumination in a narrow area. In particular, this illumination condition, as in the first form, ensures the illumination recommended for various tasks such as reading, studying, handicrafts, and sewing as specified in JIS Z 9110, and ensures high work efficiency by ensuring sufficient illumination during various tasks. Furthermore, in the second form, the desk lamp 1 is not limited to being positioned to the left of the work surface 100 as shown in the example, but can be used when the desk lamp 1 is placed at any position on the work surface 100, such as to the right of the work surface 100 or in the center. In addition, in the second form, a shadow is cast on the side opposite to the side where the worker is working, so for example, the visibility of the pen tip is high in writing tasks, ensuring good work efficiency. Specifically, for right-handed workers, the left lighting unit 5 extends forward and backward, and the right lighting unit 5 extends left and right, thereby improving usability. For left-handed workers, the right lighting unit 5 extends forward and backward, and the left lighting unit 5 extends left and right, thereby improving usability.

[0051] Figure 10 shows the illuminance when the pair of lighting units 5 are in the third configuration, for example, when the reference position V is at the center of the rear end of the work surface 100 in the left-right direction. In the third configuration, the pair of lighting units 5 extend diagonally in the front, back, left, and right directions, and the inclination angle T1 with respect to the first side 101 is the same. The angle T2 between the pair of lighting units 5 is, for example, approximately 103 degrees.

[0052] In this case, the entire area of ​​the work surface 100 (an area of ​​100 cm horizontally and 60 cm vertically) is designated as the fourth area S, and the fourth area S is illuminated with 500 lux or more. In the desk lamp 1, the angle T2 between the pair of lighting units 5 is not limited to approximately 103 degrees. In the case of the work surface 100 in this example, the entire work surface 100 is illuminated with 500 lux or more when the pair of lighting units 5 are positioned on a straight line connecting the left and right corners on the worker's side (near side) and the center of the lighting support unit 12. By positioning the pair of lighting units 5 in this way, in the third configuration, the angle T2 between the pair of lighting units 5 is greater than 80 degrees and less than 130 degrees.

[0053] Such illumination conditions are effective, for example, when working with multiple documents spread out over a wide area on the work surface 100. By working with sufficient illumination over a wide area, it becomes possible to ensure high work efficiency.

[0054] <Summary> As described above, in the desk lamp 1, the first region P is illuminated with 1000 lux or more by a pair of lighting units 5 in the first configuration, the second region Q is illuminated with 500 lux or more by a pair of lighting units 5 in the first configuration, and the third region R is illuminated with 1500 lux or more by a pair of lighting units 5 in the second configuration.

[0055] Therefore, the first region P and the second region Q are illuminated with 1000 lux or more and 500 lux or more, respectively, by a pair of lighting units 5 in the first configuration, and the third region R is illuminated with 1500 lux or more by a pair of lighting units 5 in the second configuration. Thus, the desired illuminance for each region can be secured by a simple operation of rotating the lighting unit 5 relative to the connecting part 4, thereby improving usability.

[0056] Furthermore, the pair of lighting units 5 are rotatably connected to the connecting unit 4 with a pivot axis 17 whose axial directions are the same. The first configuration is when the pair of lighting units 5 are located on the same straight line, and the second configuration is when the pair of lighting units 5 are perpendicular to each other.

[0057] Therefore, in two frequently used states by workers, where the pair of lighting units 5 are positioned on the same line and perpendicular to each other, each area of ​​the work surface 100 is illuminated with high illuminance, thereby improving the work efficiency of the workers.

[0058] Furthermore, the second form is achieved by rotating one of the lighting units 5 in the first form.

[0059] Therefore, since the pair of lighting units 5 can be transformed into the second configuration without rotating either lighting unit 5, the pair of lighting units 5 can be easily set to the first configuration and the second configuration, which are used more frequently.

[0060] Furthermore, with the reference position V coincided with the center of one of the first sides 101, the fourth region S, which is a rectangular area on the work surface 100 enclosed by the first side 101 and the second side 102 of 100cm and 60cm respectively, is illuminated with 500 lux or more by the pair of lighting units 5 in the third configuration.

[0061] Therefore, since the entire large area of ​​the fourth region S is illuminated with high illuminance, high work efficiency can be ensured for the workers.

[0062] In addition, the length of arm section 3 is set to 50 cm or more.

[0063] Therefore, since the work surface 100 is illuminated from a height of 50 cm or more, the worker's body is less likely to interfere with the lighting unit 5, and the worker can perform the work with sufficient illumination while preventing contact with the lighting unit 5 during work. [Explanation of Symbols]

[0064] 1 Desk lamp 2. Stand section 3. Arm section 4 Connecting part 5. Lighting Section 10 rotational axes 13. First hinge axis 14. Second hinge axis 15 Light source holder 15a Light-shielding rib 16 Light-emitting part 17. Pivot axis 100 work surface 101 First side 102 Second side

Claims

1. It comprises an arm portion that functions as a support column, a connecting portion connected to the arm portion, and a pair of lighting units having light sources and rotatably connected to the connecting portion, The pair of illumination units are rotatable to be in at least a first and second configuration with different positional relationships. When the intersection point of the arm portion on the work surface illuminated by the pair of lighting units is taken as the reference position, the areas with a radius of 30 cm and a radius of 50 cm on the work surface centered on the reference position are defined as the first region and the second region, respectively. A third region is defined as a square area with sides of 30 cm, with the aforementioned reference position on the work surface as one of its vertices. The pair of illumination units configured in the first form illuminates the first region with 1,000 lux or more and the second region with 500 lux or more. The third area is illuminated with 1500 lux or more by the pair of illumination units configured in the second form. Desk lamp.

2. The pair of illumination units are rotatably connected to the connecting portion with a pivot point that is oriented in the same direction in their axial directions. The first configuration is one in which the pair of illumination units are located on the same straight line. The second embodiment is one in which the pair of illumination units are orthogonal to each other. The desk lamp according to claim 1.

3. In the first embodiment, the second embodiment is achieved by rotating one of the illumination units. The desk lamp according to claim 2.

4. In the third configuration, the pair of illumination units are arranged so that the angle between them is greater than 80 degrees and less than 130 degrees. The rectangular area enclosed by the first and second sides of the work surface, which are 100 cm and 60 cm respectively, is defined as the fourth area. With the reference position aligned with the center of one of the first sides, the fourth region is illuminated with 500 lux or more by the pair of illumination units in the third configuration. The desk lamp according to claim 1, claim 2, or claim 3.

5. The aforementioned work surface is the surface of the desk, The length of the aforementioned arm portion is set to 50 cm or more. The desk lamp according to claim 1, claim 2, or claim 3.

6. The connecting portion is rotatably connected to the arm portion with a first hinge shaft and a second hinge shaft, which are oriented perpendicular to each other in their axial directions, as pivot points. The desk lamp according to claim 2 or claim 3.

7. The axial direction of the pivot axis and the axial direction of the first hinge axis are in the same direction. The desk lamp according to claim 6.

8. A stand is provided which is placed on the aforementioned work surface. The arm portion is rotatably connected to the stand portion with the pivot point as the pivot axis, The axial direction of the pivot axis is the same as the axial direction of the second hinge axis. The desk lamp according to claim 7.

9. The lighting unit is provided with a light source holder that holds the light source, The light source holder is provided with light-shielding ribs positioned around the light source. The desk lamp according to claim 1, claim 2, or claim 3.

Images