JP5603558B2 - Non-contact energy transmission device, electronic watch, charging device - Google Patents

Description

The present invention, non-contact energy transmission device capable of ensuring a good transmission efficiency, in which the electronic timepiece relates to the charging equipment.

  Conventionally, a primary side coil (power transmission) and a secondary side coil (power reception) are used to induce a magnetic flux from the primary side, and the magnetic flux is linked to the secondary side coil to thereby power the secondary side coil. There is known a non-contact energy transmission technique for transmitting a signal. When transmitting electric power, in order to absorb (release) magnetic flux more, a core with high magnetic permeability is used, whereby energy transmission can be effectively performed. One of the reasons why this technology has been widely used is that it is easy to ensure airtightness. That is, by using such a technique, energy can be transmitted in a non-contact manner, so that it is not necessary to expose the charged part during charging. For this reason, a well-known charging method is used to charge devices such as an electronic timepiece, a shaver, and a toothbrush that have water attached around them.

  Some electronic timepieces are made of plastic, and others are made of metal such as titanium or stainless steel. Each material has a unique merit. For example, in the case of plastic, there is a merit that a watch can be reduced in weight. Moreover, when comprised with a metal, there exists a merit that compatibility with skin allergy is high and an external appearance is good. By the way, when it is made of plastic, its conductivity is almost zero, so it has no effect on the magnetic flux. An eddy current loss occurs in the metal part. Eddy current loss is a loss that occurs when a magnetic flux passes through a material having electrical conductivity, and this loss usually becomes heat. As described above, when the electronic timepiece is made of metal, it is known that transmission efficiency is remarkably lowered because a large loss is caused in the casing portion. Therefore, a contactless electromagnetic induction charging mechanism that can reduce the weight of the secondary side without reducing the transmission efficiency is disclosed (for example, see Patent Document 1). Moreover, in patent document 1, the lightness of the secondary side is reduced without reducing transmission efficiency by cutting the thin part of the magnetic flux density that passes through the secondary side core (with through holes). It is proposed that it can be done. Thus, a contactless electromagnetic induction charging mechanism in which a through hole is provided in the core of the secondary coil is disclosed (for example, see Patent Document 1). This configuration is shown in FIG. As shown in FIG. 16, a technique has been disclosed in which a through hole is provided in a primary-side convex portion, thereby reducing eddy current loss and improving transmission efficiency. In FIG. 16, reference numeral 110 is a primary coil, reference numeral 111 is an E-shaped core, reference numeral 111A is a core of the core, reference numeral 112 (112a, 112b) is a coil, reference numeral 210 is a secondary coil, and reference numeral 211 is A T-shaped core, 211A is a core part of the core, 211B is a through hole, 211C is a collar part, and 212 is a coil.

JP-A-11-195545

  However, in the conventional technique as described above, when the casing portion of the electronic timepiece is made of metal, the casing portion has a large influence on the magnetic flux, and the magnetic flux directivity, that is, When the housing is made of plastic, the direction in which the magnetic flux originally changes depends on the state of the housing. Therefore, in the configuration in which the through hole is simply provided on the secondary side, the transmission efficiency is almost the same. There was a problem that the effect could not be obtained.

  The present invention has been made in view of the above, and in a non-contact energy transmission system, the transmission efficiency is further improved, and the configuration of the primary core that is lightweight and the configuration conditions of the core are more optimal. It aims to provide a means by which decisions can be made.

In order to solve the above-described problems and achieve the object, a non-contact energy transmission device according to claim 1 has a convex portion including a through hole, extends from a bottom portion of the convex portion, and surrounds the convex portion. A primary core provided with a peripheral wall part including a surface, and a primary coil wound around the convex part, and a first air core at a central portion facing the through hole of the primary side core comprises a secondary core hole is formed as a part, the primary coil by generating magnetic flux together with the primary core, the secondary side power or information via the secondary core a non-contact energy transmission device for transmitting to the coil, the area of the air-core portion of the through hole, to 0.57 to 0.7 times the area of the first air-core portion opposing the secondary core It is characterized by setting.

  The present invention is effective by configuring the area of the air core part of the through hole of the primary side core to be 0.57 to 0.7 times the area of the first air core part of the opposing secondary side core. As a result, the transmission efficiency can be greatly improved.

FIG. 1 is an explanatory diagram showing a model configuration of a non-contact energy transmission apparatus handled in an analysis simulation according to this embodiment. FIG. 2 is an explanatory view showing a state of winding the coil wire (straight lap winding). FIG. 3 is an explanatory diagram showing a state of how to wind the coil wire (shifted overlap winding). FIG. 4 is an explanatory diagram showing the dimensional relationship at each part of the secondary core with reference numerals. FIG. 5 is an explanatory diagram showing the dimensional relationship in each part of the primary core facing each part of the secondary core with reference numerals. FIG. 6 is an explanatory diagram showing the dimensional relationship in each part of the secondary side core and the primary side core with reference numerals. FIG. 7 is an explanatory diagram showing an example of an orthogonal table and SN ratio analysis according to this embodiment. FIG. 8 is a factor effect diagram showing an analysis example according to this embodiment. FIG. 9 is a graph showing the state of gain in the area relationship between the secondary core and the primary core air core. FIG. 10 is an explanatory diagram of a correction example in the calculation of the level and the gain. FIG. 11 is a graph showing gains in the cross-sectional area of the secondary core and the cross-sectional area of the primary core. FIG. 12 is a graph showing a state of gain in the thickness of the secondary core and the thickness of the widened portion. FIG. 13 is a graph showing the state of gain at the bottom width of the secondary core. FIG. 14 is an explanatory diagram showing an example in which the results obtained in the second embodiment in the primary side core and the secondary side core are summarized. FIG. 15 is an explanatory diagram showing the area ratio and dimensional ratio of FIG. 14 as a model. FIG. 16 is an explanatory diagram illustrating a configuration example of a conventional non-contact electrical device.

With reference to the accompanying drawings, the present invention the non-contact energy transmission device according to an electronic timepiece will be explained in detail an embodiment of the charging equipment.

  As a result of daily research, the inventor of the present invention has found that better transmission efficiency can be obtained if the primary side core is configured under certain conditions. Furthermore, the present inventors have found a means capable of determining the conditions of the shape and dimensions of the secondary side core and the secondary side core in the non-contact energy transmission system by a relatively simple process.

  In general, if there are no metal-like inclusions in the magnetic flux path, the non-contact energy linked to the secondary coil is the coil shape, distance between coils, input energy, core shape, core It can be assumed to some extent from factors such as permeability. However, when there are inclusions such as metal in the path of magnetic flux, the flow of magnetic flux is complicated, as well as the magnetic resistance value and the interrelationship between the primary side and the secondary side change. It is almost impossible to calculate on a desk. Therefore, the inventor of the present invention treats factors such as the shape and size of the primary side core and the secondary side core as parameters using magnetic analysis simulation (analysis by the finite element method), and transmission efficiency is improved. We examined the parameter conditions. As a result, in the present invention, by providing the through hole of the secondary side core and the through hole in the primary side core according to the state of the casing, the charging device and the electronic timepiece can be reduced in weight as well as the transmission efficiency. We have found a configuration that can be significantly improved. In the following, a detailed example will be given with a specific example.

(First embodiment)
First, FIG. 1 shows a model configuration of the non-contact energy transmission apparatus handled in the analysis simulation. In FIG. 1, the charger 100 side includes a primary side coil 101 and a primary side core 102, and the electronic timepiece 200 side includes a movement 201, a battery 202, a dial plate 203, a case 204, and a secondary side core. 205, a secondary coil 206, and a metal back cover 207. In addition, the electronic timepiece 200 and the charger 100 are regarded as being bilaterally symmetric, and the analysis was performed using a half model on one side as an analysis model. The numerical value output as a result of the analysis simulation is the output as a model rotated in a cylindrical shape around the left side surface (portion indicated by the dotted line in FIG. 1) of the electronic timepiece 200 shown in FIG. Are set to be output. The output of the analysis simulation includes input current, output current, output voltage, and the like, and the analysis was performed by setting the input power.

  Subsequently, factors that are parameters of the analysis SIM (simulator) were set as follows. For example, in the case of the battery 202, the diameter, thickness, conductivity, etc. of the battery 202 are set. For the back cover 207, the conductivity and thickness were set. The diameter of the back cover 207 varies depending on the shape of the secondary coil 206, the shape of the secondary core 205, the thickness of the case in the lateral direction, and the like. Thus, when the shape depends on the shape of another member, the shape was corrected and analyzed so as not to cause a physical contradiction. In the case of the coil relationship, the minimum necessary parameters for configuring the coil, such as the number of turns, the winding height, the coil wire diameter, the coil inner diameter, and the winding method of the coil, are set. Since the mutual relationship between the secondary core 205 and the secondary core 205 is important, a factor was set using the ratio of the shape of the primary core 102 based on the secondary core 205 at that time. Further, the room temperature, the distance between the charger 100 and the electronic timepiece 200, and the contamination of the electronic timepiece 200 were set as error factors.

The set factors are shown in Table 1. For example, in the case of the primary side coil 101,
Coil wire diameter: Coil wire thickness Coil type: Magnet wire type (0-3)
Cross-sectional area ratio: area ratio of opposing surfaces of the primary coil 101 and the secondary coil 206 (ratio when the secondary coil 206 is 1)
Turn ratio: Ratio of turns of primary coil 101 and secondary coil 206 (ratio when secondary coil 206 is 1)
Condensation winding coefficient: When a coil is formed, the coil is generally wound as shown in FIG. However, as shown in FIG. 3, there is known a winding method in which the coil wire 110 can be formed with a small shape when the coil wire 110 is wound with a slight shift to obtain the same number of turns. The condensation winding coefficient set as a factor of this analysis indicates this, and when the outer diameter of the coil that can be configured by the winding method of FIG. The outer diameter can be 0.7 to 1.0 times. The condensation winding coefficient is set within the range of 0.7 to 1.0.

  Returning to Table 1, description will be made. Core convex portion-coil upper surface: It is set as a gap between the height of the convex portion of the primary core 102 and the height of the upper surface of the primary coil 101. For this factor, when the level described later is 0, In the case of 1, the core convexity is 1 mm higher, and in the case of -1, the core convexity is 1 mm lower.

Subsequently, the secondary core 205
Bottom thickness: Dimension A in FIG. 4 Bottom width: Part B in FIG. 4 (Ratio to the width H of the lower portion of the secondary core 206: 10.5)
Wing thickness: The dimension of C in FIG. 4 is shown.

Subsequently, the primary core 102
Secondary side core air core: Primary side core air core = 1: X... This is part A in FIG. 5 and the area of the air core part of the secondary side core 205 and the primary side core 102 facing it. The area ratio of the air core part is shown. (Ratio when the air core of the secondary core 205 is 1)
Secondary core cross-sectional area: primary convex cross-sectional area = 1: X ... This is part B in FIG. The area ratio with the upper surface of the convex part of the side core 102 is shown.

Primary coil bottom surface convex part top surface: convex part height = 1: X ... This is part C in FIG. 5 and the primary side when the dimension from the primary coil bottom surface to the convex part is 1. The dimensional ratio from the bottom to the convex is shown.
Protrusion—Primary coil inner diameter (width Gap)... This is a portion D in FIG. 5 and shows a gap from the protrusion to the inner diameter of the primary coil 101.

Bottom thickness (Y direction): This is the portion A in FIG. 6 and shows the thickness of the primary core bottom.
Primary coil cross-sectional area: Core air core (large) cross-sectional area = 1: X ... This is the bottom surface of the portion B in Fig. 6 where the area of the bottom surface of the primary coil 101 is 1. The cross-sectional area ratio with the surface from the convex part of the primary side core 102 to a surrounding wall part inner side which opposes is shown.
Side portion width: This is a portion C in FIG. 6 and shows the thickness of the side portion in the lateral direction.
Secondary core top surface—Primary core top surface This is a portion D in FIG. 6 and shows a gap between the top surface of the secondary core 205 and the top surface of the widened portion of the primary core 102. When the level described later is 0, the gap is 0 (the same height). In the case of 1, the upper surface of the secondary core 205 is 1 mm higher than the upper surface of the widened portion of the primary core 102. Indicates.
Secondary-side core thickness: widened portion thickness = 1: X ... This is part E of FIG. 6 and the primary-side widened portion of the secondary-side core 205 when the thickness of the wing portion 205a of the secondary-side core 205 is 1. The thickness ratio is shown.

  Now, as described above, after setting a number of factors, the level was determined for each factor. Subsequently, regarding the level, the following settings were made. For example, the level shown in Table 2 was determined for the secondary coil 206. For the coil wire diameter, the thickness of the coil constituting the secondary coil 206 is set to 0.21 mm, 0.22 mm, 0.23 mm, and the number of turns is 115 turns, 163 turns, 171 turns. So decided. For factors other than the secondary coil 206, conditions were determined at three levels as shown in Table 1. Of course, if the conditions change, the shape of the secondary coil 206, the case 204, and the secondary core 205 will change, so the diameter, thickness, etc. of the electronic timepiece 200 will change. When factors and levels were determined in this way, we wanted to find out what conditions would be the configuration with the highest transmission efficiency, but because there are three levels for one factor (the error factor is two levels) The number of analysis simulations sometimes required can be calculated as 3 ^ (power of factor number) x 2 ^ (power of error factor number).

Since it takes a lot of time to perform such an analysis, this analysis was performed using an orthogonal table. Note that L81 is applied to the orthogonal table for the factor, and L4 is applied to the orthogonal table for the error factor. In judging whether the conditions are good or bad, transmission efficiency was used as an evaluation item. The transmission efficiency η was determined by the following formula.
Transmission efficiency η = output energy / input energy × 100

Further, the transmission efficiency η is treated as a desired characteristic, and the following formula is adopted for calculation of sensitivity and SN ratio.
ST = Y1 ² + Y2 ² + Y3 ² + Y4 ²
Sm (Y1 + Y2 + Y3 + Y4) ²
Se = ST-Sm
Ve = Se / 3
Sensitivity = 10 * LOG ((Sm-Ve) / 4 / Ve)
S / N ratio = 10 * LOG (((Sm-Ve) / 4))

  An image diagram of this analysis is shown in FIG. In this analysis, an L81 orthogonal table is set for each factor, and analysis simulation is performed with 81 patterns. An L4 orthogonal table is adopted as an error factor, and analysis is performed under four error conditions for each factor condition. In this case, since there are 81 patterns in the factor analysis and 4 patterns in the error factor analysis, the number of experiments is 81 × 4 times = 324 times in one experiment.

  In each pattern, Y1 to Y4 (transmission efficiency) are obtained, and the sensitivity and the SN ratio are obtained from the above formulas based on the values. In this case, the meaning of the sensitivity and the SN ratio means that the higher the sensitivity is, the higher the transmission efficiency is. The higher the SN ratio is, the more stable the error factor (disturbance) is. It means that there is. In this way, after obtaining the sensitivity and the S / N ratio, the best conditions are examined by creating a factor effect diagram.

  FIG. 8 is an example of a factor effect diagram, and the values in Table 2 are set as the coil levels. For example, the coil wire diameter is set to 0.21 mm, 0.22 mm, and 0.23 mm from the left, and the condition for the best transmission efficiency is the portion surrounded by the dotted line (0.23 mm) in FIG. Become.

  In addition, other factors can also be obtained as a condition that the portion surrounded by the dotted line is most efficient. By the way, in the above-mentioned example, the coil wire diameter of 0.23 mm could be obtained as the best condition, but the best conditions here are 0.21 mm, 0.22 mm, and 0.23 mm. Actually, 0.24 mm, 0.25 mm, etc. may be better because it is within the set range. Because this is a concern, this analysis simulation does not end with one experiment (324 experiments), and after finding the best condition in a certain experiment, The analysis was repeated.

  Taking the coil wire diameter as an example, if 0.23 mm is better within the range of 0.21 mm, 0.22 mm, and 0.23 mm, the next analysis will be 0.22 mm, 0.23 mm, 0.24 mm, etc. The level was shifted so that the best conditions were the center of the previous experiment, and the experiment was repeated. By repeating the experiment in this way, it is possible to analyze the tendency of each factor in a wide range, not a solution under a certain local condition. Further, by calculating the level and gain of each factor, a more optimal level can be found within the range.

  Furthermore, by approximating the relationship between the level and the gain and calculating the gain based on the approximation, it is possible to find an appropriate level even outside the set range.

(Second Embodiment)
When the analysis of the first embodiment was performed, it was found that the relationship between the cross-sectional area ratio and the dimensional ratio of the primary core 102 and the secondary core 205 has the following characteristics.

  First, when the factor: secondary core air core: primary core air core = 1: X and the level and gain were calculated for this factor, FIG. 9 was obtained.

  As shown in FIG. 10, for the calculation of the level and the gain, since this experiment is repeated, the absolute value of the gain increases each time it is repeated. In order to see the trend of

  As can be seen from FIG. 9, there is a pole having the maximum gain in the vicinity of 0.57 to 0.7. That is, when the area of the air core part of the secondary core 205 is 1, the area of the air core part of the opposing primary core 102 is approximately 0.57 to 0.7, and the primary core air core part. It was found that a higher gain can be obtained by configuring the above.

  Subsequently, in the graph shown in FIG. 11, the secondary-side core cross-sectional area: primary convex cross-sectional area = 1: X, but the gain becomes the maximum at 1.23 to 1.35 when the figure is seen. It can be seen that there are extreme points. That is, when the cross-sectional area of the lower part of the secondary core 205 is 1, the area ratio of the upper surface of the convex part of the primary core 102 facing it is approximately 1.23 to 1.35. It was found that a higher gain can be obtained.

  Subsequently, in the graph shown in FIG. 12, the secondary-side core thickness: the widened portion thickness = 1: X. That is, the thicker the widened portion of the primary core 102, the better, and a gain can be obtained. However, in mounting, for example, when the electronic timepiece 200 is arranged on the secondary side, if the excessively widened portion is too thick, the electronic timepiece 200 becomes difficult to remove, or when the core is configured, the widened portion In some cases, it may be difficult to mold the primary core 102 due to the stress applied from the surface. If such a situation is a concern, the thickness of the widened portion is set to the first range (2. 7 or less), and it is desirable that the first range (3.5 times or more) shown in the figure be used when there is no particular limitation in manufacturing without impairing convenience. Here, when the thickness of the widened portion is in the range of 2.7 to 3.5 times, as shown in the figure, the gain hardly changes. In this range, it is best to configure with a thickness of 2.5 to 2.7 times that can obtain the maximum gain. When the width of the portion shown in FIG. 6C is thick, the diameter of the electronic timepiece is large, or when it is desired to widen the gap between the electronic timepiece and the widened portion (when it is easy to take the watch), , It does not necessarily have to be widened inward, and conversely it may be reduced.

  Subsequently, when looking at the secondary core bottom width of the graph shown in FIG. 13, it was found that there is a pole where the gain is maximum in the vicinity of 1.75 to 2,0.

(Third embodiment)
Here, when the results obtained in the second embodiment are arranged, it is possible to obtain the highest transmission efficiency (high gain) by configuring the primary side core 102 and the secondary side core 205 as shown in FIG. )

  In FIG. 14, the area of the air core part of the secondary core 205 and the air core area of the convex part of the primary core 102 facing it are configured in a ratio of 0.57 to 0.7, and the secondary part The area of the lower part of the side core 205 and the area of the convex part of the primary side core 102 opposite to the area are configured in a ratio of 1.23 to 1.36, and further, the second air core part of the secondary side core 205 When the length of 210 is 10 and the width of the secondary core is 0.5 as shown in FIG. 14, the bottom width (B) of the secondary core 205 is a ratio of 1.75 to 2.0. The best gain can be obtained.

  Here, A and B are A + B = 10.5 and B = 1.75 to 2.0, so A = 8.75 to 8.5, so that 8.75 / 1.75 = 5, 8 Since it can be calculated as .5 / 2 = 4.25, the maximum gain can be obtained by generally configuring as A = 4.2 to 5.0B.

  Further, when a model is configured with the above area ratio and dimensional ratio, the detailed dimensions are as shown in FIG. The analysis simulation is performed for the electronic timepiece 200, and the size of the built-in rechargeable battery is φ20 mm. In addition, although the model of FIG. 15 is a half on one side, the dimension described is a diameter (overall diameter).

In this configuration,
The ratio of the area of the air core part of the secondary side core 205 and the air core area of the convex part of the primary side core 102 facing it is as follows:
14.2 ^{2 /} 17.5 ² = 0.65,
The area ratio between the area of the lower part of the secondary core 205 and the convex part of the primary core 102 opposite to the area is as follows:
(19.9 ² -14.4 ² ) / (21.2 ² -17.5 ² ) = 1.36
Furthermore, the ratio of A and B is
(21.2-17.5) /2=1.85 ... secondary side core bottom width (B)
21.2 / 2 = 8.75 ... Radius (A) of the first air core of the secondary core
Therefore, the configuration is A = 4.79B.

  When an analysis simulation was performed with this configuration, it was possible to transmit power with a transmission efficiency of about 70%.

  Therefore, in the primary side core 102, the diameter of the air core part of the through hole is φ14.2 mm, the outer diameter of the upper surface of the convex part is φ19, 9 mm, and the inner diameter of the first air core part of the opposing secondary side core 205 is Is set to φ17.5 mm, and the diameter of the secondary core bottom portion is set to φ21.2 mm, an effective gain can be obtained, and as a result, transmission efficiency can be greatly improved.

  As a condition of the secondary core 205 when a general secondary battery (φ20 mm or so) is incorporated, the inner diameter of the first air core portion of the secondary core 205 is configured in the range of φ16.5 to 18.5 mm. In addition, with the above-described configuration, an effective gain can be obtained, and as a result, transmission efficiency can be greatly improved.

(Fourth embodiment)
Here, the primary side core 102 to the secondary side core 205 are configured with the configuration of the third embodiment, and as the coil condition, the secondary side coil 206, the number of turns thereof is 153 [turns], and the coil wire diameter is φ0. .21 [mm], winding height 1.3 [mm], coil inner diameter φ29.6 mm, coil outer diameter φ21.2 mm, and the coil wire diameter of the primary coil 101 is φ0.36 mm, 1140 [turn] The winding height is 18.71 mm, the inner diameter of the coil is 21.4 mm, the outer diameter of the coil is 33.23 mm, and the thickness of the metal portion is 1 mm. When such a configuration was adopted, it was confirmed that transmission efficiency was dramatically improved in the actual machine test.

  Therefore, according to the embodiment described above, as shown in FIG. 14, the area of the air core part of the through hole of the primary side core 102 is set to be equal to that of the first air core part of the opposing secondary side core 205. By configuring with an area of 0.57 to 0.7 times, it becomes possible to obtain an effective gain, and as a result, transmission efficiency is greatly improved.

  Further, as shown in FIG. 14, it is possible to obtain an effective gain by configuring the area of the top surface of the convex part to be 21 to 1.35 times the area of the opposed secondary core bottom part. As a result, the transmission efficiency is greatly improved.

  In the above, the ratio of the width H of the first air core portion of the secondary core 205 to the width H ′ at the bottom of the secondary core is in the range of 4.2H ′ <H <5.0.5H ′. With this configuration, an effective gain can be obtained, and as a result, transmission efficiency can be greatly improved.

  Moreover, it becomes possible to obtain an effective gain by configuring the shape of the widened portion with 3.5 times or more the thickness of the opposing secondary core 205, and as a result, transmission efficiency is greatly increased. Can be improved.

  In addition, when the thickness of the widened portion cannot be increased due to restrictions on the manufacturing of the primary side core 102, the range of 2.5 to 2.7 times that can achieve a particularly effective gain among the relatively thin thicknesses. By configuring the widened portion, the transmission efficiency can be greatly improved.

  Further, by applying the configuration (conditions) according to this embodiment to a non-contact type electronic timepiece, it is possible to ensure good transmission efficiency. In addition, a non-contact type electronic timepiece (the back cover is made of metal) and its charging device can be obtained.

  Further, by performing the processing described in the first embodiment on the primary core 102 and the secondary core 205 of the non-contact energy transmission system, the magnetic coupling between the charging device 100 and the electronic timepiece 200 is achieved. As a result, various conditions of the primary side core 102 and the secondary side core 205 that can ensure good transmission efficiency are obtained.

  In addition, the shape of the primary side core 102 and the secondary side core 205 of the non-contact energy transmission system is determined based on the size, area, and comparison relationship thereof in accordance with the core shape determination method described above. As a result, the magnetic coupling between the charging device 100 and the electronic timepiece 200 can be greatly increased, and various conditions of the primary side core 102 and the secondary side core 205 that can ensure good transmission efficiency are obtained.

  Moreover, by approximating according to the core shape determination method described above, the primary side core 102 and the secondary side core 205 of the larger non-contact energy transmission system are not limited in size (level). Various conditions are obtained.

As described above, the non-contact energy transmission device according to the present invention, an electronic timepiece, the charging equipment is useful, such as in small electronic devices such as electronic timepiece, in particular, the non-contact charging apparatus which can ensure a good transmission efficiency Suitable for the core shape to be used.

DESCRIPTION OF SYMBOLS 100 Charger 101 Primary side coil 102 Primary side core 110 Coil wire 200 Electronic timepiece 201 Movement 202 Battery 203 Dial 204 Case 205 Secondary side core 206 Secondary side coil 210 2nd air core part

Claims (9)

A primary core having a convex portion including a through-hole, extending from the bottom of the convex portion, and provided with a peripheral wall portion including the peripheral surface of the convex portion, and a primary wound around the convex portion Side coil,
A secondary core having a hole serving as a first air core portion formed in a central portion facing the through hole of the primary core;
The primary side coil is a non-contact energy transmission device that transmits electric power or information to the secondary side coil through the secondary side core by generating magnetic flux together with the primary side core,
The non-contact energy transmission device characterized in that the area of the air core part of the through hole is set to 0.57 to 0.7 times the area of the first air core part of the opposing secondary core.   2. The non-contact energy transmission device according to claim 1, wherein an area of an upper surface of the convex portion is set to 1.23 to 1.35 times an area of a bottom portion of the opposing secondary core.   The ratio of the width H of the first air core portion of the secondary core to the width H ′ at the bottom of the secondary core is set in the range of 4.2H ′ <H <5.0H ′. The non-contact energy transmission device according to claim 1, wherein the non-contact energy transmission device is a non-contact energy transmission device.   4. The non-contact energy transmission device according to claim 1, wherein an inner diameter of the first air core portion of the secondary core is set to φ16.5 to 18.5 mm. In the primary side core, the diameter of the air core part of the through hole is φ14.2 mm, the outer diameter of the upper surface of the convex part is φ19.9 mm, and the inner diameter of the first air core part of the opposing secondary side core The contactless energy transmission device according to any one of claims 1 to 4, wherein a diameter of the bottom of the secondary core is 21.2 mm. The primary core has a widened portion that is located near the upper surface of the convex portion from the upper end portion of the peripheral wall portion and higher than the upper surface of the convex portion,
The widened portion is set to a thickness of 3.5 times or more or 2.7 times or less of the thickness of the secondary core facing the widened portion. The non-contact energy transmission device described in 1.   The contactless energy transmission device according to claim 6, wherein a thickness of the widened portion is set in a range of 2.5 to 2.7 times.   A non-contact rechargeable electronic timepiece using the non-contact energy transmission device according to claim 1.   A non-contact rechargeable charging apparatus using the non-contact energy transmission apparatus according to claim 1.

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